You found X, so replace X in the equations and solve for those.
The equation 5x-17 is a vertical angle with 2y+5 and the right angle (90 degrees), which mean those are equal.
5x-17 = 5(26) -17 = 130 - 17 = 113
2y+5 + 90 = 113
2y + 95 = 113
2y = 113 - 95
2y = 18
y = 18/2
y = 9
