Answer:
c
Step-by-step explanation:
An isosceles triangle. This triangle has 2 sides that are equal.
I can't see the options, but you would need to multiply (4x - 2y = 7) by 3, and (3x - 3y = 15) by 4 so that you get 12x in both equations. Then when you subtract, you eliminate 12x. I hope this helps!
Answer:
the right triangles are B,C,D