angle 1 = angle 2 and angle 3 = angle 4
3x+2y=110
9x+y=70 (Now combine the the two equations by multiplying the second equation by negative two)
3x+2y=110
-18x-2y=-140 (Add them together)
-15x=-30
x=2 (Substitute 'x' into one of the original equations)
9(2)+y=70
18+y=70
y=52
To check answer, substitute both 'x' and 'y' into one of the original equations.