Answer:
One angle is 70 and the other angle is 110
Explanation:
x + 40 = y
x + y = 180 Supplemental angles add to 180
Substitutes x + 40 into the second equation by y
x + x + 40 = 180 Combine like terms
2x + 40 = 180 Subtract 40 from both sides
2x = 140 Divide both sides by 2
x = 70
Substitute in 70 for x in either of the original 2 equations
x + y = 180
70 + y = 180 Subtract 70 from both sides
y = 110