Hi would you be able to help me? I understand part C, but I'm not too sure of how to handle parts A or B. I've tried a few different ways but still can't come up with an answer at all. If you can, could you also do part C though, I'd like to see if my understanding is correct.

​

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.