C. Y = 3/10x + 1/2
....................
<span>5x-6y=-15
5x+6y=12
---------------add
10x = -3
x = -3/10
x = -0.3
</span>5x+6y=12
5(-0.3) + 6y = 12
6y = 12 + 1.5
6y = 13.5
y = 13.5 / 6
y = 2.25
Okay, I understand. You found the correct answer. I won't get points. Sniffle.Sniffle.
Both angles should be 90degrees