When NOT to use Desmos on the Digital SAT

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[@onlyw9139]

(quick note, I currently have 700 in Math, but March SAT was my first one, so I hope it will improve in the future) In the 3rd example (15x² - 32x + c = y), yes it is not efficient to plug the whole equation in desmos, but it is still useful to put 32² - 4(15)c = 0 because it reduces time and chance of error. Also, 256/15 is 6 characters long and 17.067 can be rounded to 17.07.

[@emiliaowen2387]

Love ur viveos! they are so helpful! thank you!

[@mx4690]

For 2, you can graph the two equations and see where they intersect. You can also estimate the solution as root of 3 is less than 2 and root of 5 is bigger than 2, so it becomes obvious in the grided diagram. 0 computation involved.

[@jwmathtutoring]

Exactly. Plus, one of the solutions has a negative x & y coordinate so you can eliminate B & D right away and you only have to check 2 answers, not 4.