The sum of (a-b)^2 and (a+b)^2​

Iwill give you ! what is the measure of ∠v ?

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

Can someone tell me if this is perpendicular? !