Question

The angles of a triangle are x , y , and 40 ? . The difference between the two angles x and y is 30 ? . Find x and y

Answer 1

x-y=30
x=30+y
x+y+40=180
30+y+y+40=180
y=55

x=30+y
x=85

Answer 2

given,
x+y+40=180 (by angle sum property in triangle)
and x-y=30

now
x-y=30
x=30+y
put in other equation
x+y+40=180
30+y+y+40=180
2y=110
y=55

x=30+y
x=30+55
x=85