Question 692936
X=4Y-20
X+Y=180
(4Y-20)+Y=180
5Y=180+20
5Y=200
Y=200/5
Y=40 DEGREES FOR THE SMALLER ANGLE. 
X=4*40-20
Y=160-20
Y=140 DEGREES FOR THE LARGER ANGLE.
PROOF:
40+140=180
180=180