Question 256194
x=2y-18
x+y=90
2y-18+y=90
3y=90+18
3y=108
y=108/3
y=36 degrees ans. for the smaller angle.
x=2*36-18
x=72-18
x=54 degrees. ans. for the larger angle. 
Proof:
36+54=90
90=90