Solving Linear Equations Using the TI 83 or TI 84 Series Calculator

[@kadiekeane168]

I am 53, in college, and had no clue how to use my graphing calculator. After watching this video, I was like “Where have you been all my life!), great tutorial and I love that you provided a pdf instruction that I printed out. Thanks for making my life easier.

[@princebrown3327]

Thank you for these instructions. i recently purchased an old TI-84 and needed instructions on how to use it to solve linear equations. U Saved me so much grief and time.

[@philaciousnessicity]

I'm glad I could help.

[@jouranoos]

Great explanation! Another fun fact is that, when checking the answer by making the calculation, the value on both sides equals the Y value of the graph intersection. So both results are shown in the graph to check afterwards:)

[@charlesjohnson6404]

I'm in the same boat from the previous comment. only 12 years ago...Big help and thank you for publishing!

[@erinsoulier6776]

You are a lifesaver! Thank you so much for this, now if i can memorize the steps i might pass my midterm.

[@philaciousnessicity]

You're most welcome

[@philaciousnessicity]

Ladies and Gentlemen: I don't mind criticism. However, I ask that you keep it constructive and decent. If you would just like to troll, I'm sure that Facebook would be more than happy to accommodate you.

[@mamagaming5132]

philaciousnessicity Is is true that everytime there’s a straight line,It’s always a linear equation? Please answer. Have intern assessment tommorow

[@philaciousnessicity]

@@mamagaming5132 Sorry that this comment did not pop up in my email. The short answer is no, not every straight line is a linear equation.

[@yeety1208]

How can anyone criticise this video?!

[@philaciousnessicity]

@@yeety1208 It happens. I don't mind it except when people just comment to say "ths iz trasch" or w/e they type now...lol

[@lisared6267]

I LOVE this video, you took me step by step. Thank you so much!

[@philaciousnessicity]

You are welcome.

[@yeety1208]

I find this way much easier than the rref way and it's much cooler because you also get to see a graph! Thanks ;)

[@philaciousnessicity]

Solving single variable linear equations with matrices? That seems ill-advised to be quite frank about it.

[@shadaerandall8098]

Thank you, this was a great video. I was having a hard time in my Math Finite class. Thank you very much!

[@JazmineHorizon]

thank you thank you thank you thank you!! this video helped me pass my math class!!!!

[@philaciousnessicity]

You're welcome. Make sure that you understand "why" it is that way though. The understanding makes it easier.

[@philaciousnessicity]

Please check your graphing settings by pressing "2nd" "ZOOM" to activate the 'FORMAT' option. 4th line down should be options for AxesOn/ AxesOff. Be sure that AxesOn is selected (darkened). If it isn't, scroll down to it and press "ENTER" to activate it. Outside of that, I would need to see your screen. Hope this helps. Let me know how it comes out.

[@Nildababy]

Hi my screen is showing ERR: INVALID DIM I did as you prompted and it's still not working

[@Wacypro]

Loved the video. Very clear and streight forward instructions

[@philaciousnessicity]

Thank you. I'm glad I could help :)

[@MrJosh6889]

I appreciate your video. I'm a bit older than the average student. In fact, the last time I studied Algebra was about 15 years ago. Now I'm being thrust into sink or swim mode with a math class covering linear equations, and another covering pre-calc. Your video is the most succinct I've found. Is there another place you compile your information or is this channel the extent of it? Thanks.

[@philaciousnessicity]

+MrJosh6889 This is pretty much it. I started making these videos for my college students. However the time requirement of compliance to the Americans with Disabilities Act's Closed Captioning of all instructional videos is just too much. If you have video suggestions, I'll certainly do my best, but I can't guarantee compliance.

[@MrJosh6889]

I appreciate the answer and understand. We're all very busy after all. I really do want to thank you for the content you have provided. I will be making use of it as holes (and there are many of them) in my knowledge become apparent.

[@lindacampbell4238]

Thank you so much this information on how to use the TI 83 was hlepful

[@philaciousnessicity]

I'm glad I can help!

[@clashsensei8267]

Duse thanks so much. Saving my physics

[@philaciousnessicity]

I'm glad I could help!

[@RudyRuachoReyRua]

Thank you, Love how you explain things, Two thumbs up!

[@philaciousnessicity]

Rudy Ruacho I'm glad I can help!

[@Bigsmall313]

you saved my life

[@leifmeadows3782]

This was helpful, thank you

[@haydenhodges6663]

Thanks, this is really helpful!

[@GaiusJuliusCaesar59]

I like to call it the algebralator Im in 7th grade algebra 1 honors and this thing comes in very handy

[@naderhumood]

Thank you Sir. Deligintly great 👍 video.

[@SarvenazS1984]

amazing video, very clear instructions...thank you very much...

[@philaciousnessicity]

I'm glad I could help!

[@bakaren8547]

So, I've got "ERR: NO SIGN CHNG" showing up on my screen. I also cannot zoom in. Any suggestions??? I need help with this ASAP!!

[@bobferguson4881]

Nvm, I fixed it. Thanks a lot. I have midterms in two days. This will be very helpful.

[@philaciousnessicity]

I'm glad this was able to help.

[@kellsliving3220]

philaciousnessicity i have a college quiz on the 24 i’m a wreck rn cause i can’t figure how to use like x or y

[@dacasweet5193]

Thank you for this. I would just remind you that once you have found the intersect point, the x value can be recalled using the X button. Also, I am struggling to think of a straight line that does not have a linear equation, what examples were you thinking of?

[@philaciousnessicity]

Technically, x/x produces a straight line (or looks to be...but isn't quite a line), but it isn't a linear equation. Honestly, I haven't watched the vid since I made it, so not sure the context. I'll try the x-value recall. Thank you for that info.

[@studyguides7670]

Thank you, this video was a big help.

[@philaciousnessicity]

Glad I could help

[@Navarretekev]

Sir is finding the intersect the same thing as doing the equation on paper except using the calculator while using the graphing method

[@wererich]

You're awesome!!!! Love the printed version too.

[@philaciousnessicity]

I'm certainly glad that I could help!

[@mrcat3493]

Great video, extremely helpful

[@Patawantress]

This was so helpful! Thank you!

[@philaciousnessicity]

+Ashlie Murray Glad I could help

[@clairt9622]

HUGE help! Thank you so much!

[@philaciousnessicity]

Clair T Glad I could help.

[@bodyworkz]

Can I solve problems liek this on the Ti 84 plus... (2x^3y^5)^3 PLEASE help..I cant find anything online.

[@philcollins2595]

+bodyworkz My first thought is that you're looking for the answer 8 * x^9 * y^15 using rules for exponent manipulation. If that's the case, I'm sorry, but the TI-83/84 will not work through problems of that type. You need a CAS (Computer Algebra System) for that capability. The TI-89/92/Voyager as well as the TI-NSpire CAS have that ability. The best the TI-83/84 can do is check your answer using numbers...put your original expression in (2 * x^3 * y^5)^3, press the "2nd" key and "math" for the "TEST" menu. Select the "=" option by pressing "1" or "Enter". Finally, put what you think the answer is...for example 8 * x^9 * y^15. Press "Enter"...if the answer is a 0, it's false, and your expansion is incorrect. If it's a 1, it's true, and you've found the answer. That's the best it has without some additional programming/apps.

[@bodyworkz]

Is there a program/app I can get that will simplify expressions like this?

[@marlaluz1235]

Thank you this was really helpful.

[@philaciousnessicity]

Glad I could help :)

[@marlaluz1235]

I actually have a had time with Algebra so far I am using pre Algebra in college and the one thing I don’t like is the teachers can’t help you, I haven’t been in School for 10 years and some of teachers think you should know it. Unfortunately I didn’t use pre algebra.

[@philaciousnessicity]

@@marlaluz1235 I know in my own classes I'm sometimes back-to-back and so I don't have time for my students that way. I always try to make myself available outside of the class however. Unfortunately you also may be caught up in a national effort to speed students through the math courses. Going faster typically does not mean that you get more help...sad really. I would suggest going to their office hours everyday. Bug the snot out of them. That's how I made it through.

[@marlaluz1235]

I agree I definitely will ask them for help and also bug the crap out of you with help as well 😂 I do want to pass so bad and I don’t want Algebra to be the reason I don’t pass.

[@kelendriaroberts3358]

This Preety much refers to the distributive, associative and communicative property?

[@philaciousnessicity]

If solving by hand, you could use all of those (commutative btw...to commute is to move locations). However, this is more of a "cheat" to get around having to solve by hand. I'm not a fan since I don't care for math-magic, but people just trying to survive math...this is for them.

[@Beavis3124]

Thanks for the help! My TI84 how do I get my X axis and Y axis to show? Mine is not visible, even after zooming out.

[@KumbiaAllStarzLover1]

Can this method work even if you have a different letter other than x? for example (y-11)-(y+8)=6y or 2(w+3)-10=6(32-3w)

[@philaciousnessicity]

Yes, but since the basic graphers (TI-83/84, 82, 85, 86, 73) can't really do algebra (no CAS), you'll just need to convert whichever letter you have to an "x". Then pop it in, solve it, and resubstitute your original letter in.

[@DeezRnuttz]

that was very useful thank you so much buddy.

[@philaciousnessicity]

Glad I could help.

[@gloria353]

Hello ı liked your video and how can we write this symbols (α, β ,ϒ) in TI 84 (PLS for my homework)

[@philaciousnessicity]

In the calculator itself or just as a symbol on paper? Outside of theta, I don't think the 84 series uses the Greek alphabet.

[@sheenacampbell9227]

How do you solve this without graphing? I just need the answer. I could not find out how to put the equal sign in without it solving the 2x+3 I still needed the second part

[@philaciousnessicity]

In this calculator, you don't solve it any other way. There is no Computer Algebra System installed. You could change the nature of the problem and use matrices, but that's even more complicated. To solve this though, you don't use the equal sign of the calculator...that does something else.

[@anaclaramathiasmoreira3257]

Hello! I can't keep my selection in Y2. I can only graph the first equation. Even is I select the equal sign and press enter, when I press "graph" I can see only the first equation and when I'm back to Y= the equal sign for Y2 is not selected. How can I fix that? Can you help me? :)

[@philaciousnessicity]

Just to be clear, an option is "selected" if it has a black outline with white lettering. Be sure that both of your Y1 and Y2 equal signs look like this. Another thing to check are the plots at the top of the Y= menu. Be sure that none of them are selected either. You can get to those by pressing the UP arrow key from the Y1 position.

[@anaclaramathiasmoreira3257]

Thanks for the quick reply! Yes, both equal signs are selected when I press [Graph], but then only y1 is shown, and when I return to [y=], y2 is not selected anymore. Nothing at the top is selected. What I noticed is that instead of the backward slash before the equations (y1, y2, etc) there is like a "forward" symbol, and when I select that to edit, I can only change that to "fast forward" or "play" symbols. I don't know how to have the slashes again. I believe that would solve the problem.

[@philaciousnessicity]

Those are alternate lines to display. The order is: thin line, thick line, shade above (greater than), shade below (less than), trace while graphing, trace path w/o graphing line, and dotted line. If you only have a circle there, that would be an issue. Keep pressing "ENTER" on the icon to the left of Y2 until a thin, connected line appears. It should match the default in the others (Y3, Y4, etc.) Another option is the window isn't large enough (zoomed correctly) to view both equations. I recommend pressing "ZOOM" then selecting option 0 (ZoomFit). See if those help. It's difficult without being able to play with it ;)

[@leonardkelley3520]

Thank you sooooooo much for this video!!!!

[@philaciousnessicity]

You're welcome!

[@leahw26]

it says the instructions have been deleted....

[@itsmissmelanie]

Whenever I try it my calculator says ERR : INVALID DIM 1 : Quit please help idk what to do!!!

[@philaciousnessicity]

Press the "y=" button to the lower left of the screen. Make sure the "plots" up top are white with black letters. If any are black with white letters, use the arrows to move to them, and press "ENTER". I have a feeling that the plot dimensions are in place causing the "invalid dimension" issue.

[@philaciousnessicity]

Do you have one in mind, or just in general?

[@JohnnyCrack]

I know I'm 3 years late, but it's because "plot 1" is highlighted under your Y= table. Hopefully you're not still stuck on the same homework question.

[@numan1114]

Thanks for the vid helped me pass my test but you can also use the numeric solver right? it worked for me. you go to math and all the way down and put in the equation.

[@philaciousnessicity]

Numan1114 You may be able to, I'm not certain. I don't believe my emulator has that option. If it works, I say "Use it!"

[@-Anunnaki-]

Thanks dude!, you da bomb.

[@philaciousnessicity]

You're welcome!

[@npadgoldie]

Thank you. This really helped me. :-)

[@philaciousnessicity]

Nereida Goldie Padilla Glad I could help

[@bobferguson4881]

I got "Invalid Dim" and can't change the window.

[@philaciousnessicity]

I try to get back to people ASAP, but it's been a crazy couple of days. What was the issue? My first thought is that the intersection didn't happen on screen, and you needed to change your window settings.

[@MissSleepyMia]

Big THANK YOU!

[@philaciousnessicity]

You're welcome.

[@relok3z429]

Finally I can use this to cheat on my test thank you

[@philaciousnessicity]

I'd be interested to know how it's cheating. Good luck on the test.

[@relok3z429]

philaciousnessicity my math teacher never shows us this trick or calculator lessons

[@philaciousnessicity]

@@relok3z429 seems ill-advised. It's like telling you that you can use a forklift to stock items then not show you how. Though to be honest, these calculators can do a lot more than what we normally have time for :)

[@lisared6267]

The link you have provided is no longer working. Please repost.

[@philaciousnessicity]

I have reposted the link. Honestly, I had no issues with it in Chrome, so I'm not sure why it didn't work for you. Here is the link again in the comments. Perhaps this will work better. drive.google.com/file/d/0B5lp1_mbNghfVFJ5Y3V5bWVodGs/edit?usp=sharing

[@philcollins2595]

@Iala Rennea: I'm glad I can help

[@dennisauthor8072]

Are you teaching alg 1 or 2?

[@philaciousnessicity]

Dennis Author Yes. Actually, I teach Basic and Intermediate Algebra courses (essentially the equivalent of Alg 1 and parts of Alg 2) at a community college. I make these for my students and give everyone access.

[@Mo-bt5mf]

I'm doing the steps I go to zoom then sreen says err:invalid dim

[@philaciousnessicity]

Press the "y =" button. Is there any "plots" at the top that have a black background?

[@angieclaxton]

Very helpful....Thank you

[@rose242cita]

when i tried to graph it or zoom it said it was an invalid dimension. but i entered everything correctly. I have the exact same graphing calculator as you. sigh

[@philaciousnessicity]

jamie petty 1) press the "y=" key...are any of the plots on? If so, shut those off. 2) if that doesn't do it press the window key. Make sure that X is set from -10 to 10. If that doesn't work I would normally tell you to let me play with your calculator, however that's really not an option here. So just comment again we'll work something else out.

[@rose242cita]

philaciousnessicity wow thank you so much for replying will try it and see if it works

[@elisandramercurio5503]

thank you so much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@philaciousnessicity]

You're welcome!

[@alexanderarnold4810]

There's always been a USB plug on the TI-84.

[@philaciousnessicity]

Yes, there has been.

[@MrHishamMath]

Thank you

[@erikawilbur3821]

Thank you!

[@farahb6383]

ily tysm

[@michelledane-smith1201]

Very helpful

[@philaciousnessicity]

Glad I could be there!

[@patrickhenry6695]

thank you so much

[@philaciousnessicity]

You're welcome.

[@stephenjones6472]

Check: 32 = 32! (mental math) :)

[@shsdh2318]

thank you know I can solve them

[@savannahtoddy3800]

thank yoooouuu!!!

[@jasonmcmechan2072]

Jesus Christ is Lord of all! God bless you all! Nothing, and I mean NOTHING, is too difficult for the Lord our God, with Christ, ALL things are possible!

[@Jr-nd9kd]

yaaaas thank you jesus

[@mfalcone1683]

Holy fuck you are so slow but very helpful

[@STFUalejandro]

it's a 260 science calculator. oh well I think it is. git. test

[@JoseDiaz-er4ww]

That voice... really disturbing.

[@philaciousnessicity]

You should hear it now...deeper

[@bradtrisdale2974]

dosn't need to be over 10 min

[@philaciousnessicity]

I completely agree with you. The problem can be done in your head in

[@stevenscottoddballz]

I hope there are still people reading & answering questions here. How do I ask [3X^2 + 12X - 12 = X^2 - 4X + 4] True or False?

[@philaciousnessicity]

Enter it exactly like that. Be sure to use the test menu for the equality. Then store I would say five different prime numbers in for x using the ”STO" command. If all five turn out to be true it's a reasonable assurance but not a proof.

[@stevenscottoddballz]

@@philaciousnessicity I am new to this. Where is the Test Menu?

[@philaciousnessicity]

@@stevenscottoddballz 2nd key then "math" button 2 down from that. I believe first menu is the relation menu.