Learn to solve a system of three equations

[@ivonnelopez8203]

can we solve this by the substitution method? have you made a video on that?

[@deniseperez2538]

How do you know what number to multiply the whole equation by? Would it be the LCD?

[@brianmclogan]

LCM

[@raelene292]

Hey Brian! For some reason Im having trouble with the system: 3x + 2y + z = 7 5x + 5y + 4x =3 3x +2y +3z =1 someone said to add so i aded the 1st and 3rd equation and got x= -3, but now i dont know what to do and im stuck?

[@raelene292]

Would you plot -3 into the second equation? I have this: 5x+5y+4(-3)=3, is that correct?

[@brianmclogan]

yes, now plug that into two equations for z and then using elimination to solve for the remaining variables.

[@stephenbarker100]

solutions are X = 4 Y = minus 1 Z = minus 3

[@dragonstudent3198]

Stephen barker ur answer was wrong bitch

[@nessababy4640]

How do you do 160x+1100y+90z 105x+805y+30z X + Y = 256

[@dismasmalembeka260]

x+5y-3z=-9 2x-3y-z=19 3x+4y+z=-13 I need your help with this problem Brian McLogan please

[@brianmclogan]

follow the same process as the video, at the end of the video I have more examples in a playlist if this video did not help

[@MrJonnergonzalez]

How did 35+19z=35 becomes Z= 0 ?

[@getrudenambaya8176]

Nice 1 sir

[@nareshgaur6375]

Nice sir ✌️

[@riceforlife7919]

how do u get 7

[@alyssiajones1809]

how does x-z=5 turn into x=5=z?????

[@AnimalStreamsaysAnimalMeme]

time for you to get new glasses

[@barbrasichita1404]

Please help me to solve 2x_y+z=3 x+2y_z=1. 5x-5y+4z =8