X-y=5 and x+y=-10
Find if it’s Perpendicular, Parallel or Neither

The answer would be perpendicular

Explanation:

You should use desmos when wanting to graph lines or equation just a reccomendation

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225