Solve for x and y.

parallel lines

x = 12, y = 14

x = 4, y = 14

x = 8.6, y = 4

x = 12, y = 4

Because the two lines are parallel, the vertically opposite angles will be congruent, and because of the definition of supplementary angles, you can set (15x - 5) = 180 - 125 then solve for x.

15x - 5 = 55

15x = 60

x = 4

There's only one option when x = 4, so y must = 14.