Answer:
x + y + (y - 18) = 180
x = 86
y = 56
Step-by-step explanation:
The sum of the measures of the angles of a triangle equals 180.
x + y + (y - 18) = 180
x + 2y - 18 = 180
x + 2y = 198
x + 2y = 198
3x - 5y = -22
-3x - 6y = -594
(+) 3x - 5y = -22
----------------------------
-11y = -616
y = 56
x + 2y = 198
x + 2(56) = 198
x + 112 = 198
x = 86
