Tentukan nilai x dan y.

c. 2x + 40 = x + 80
x = 40°

y + (x + 80) = 180
y + (40 + 80) = 180
y = 180 - 120
= 60°

d. x = 180 - 102 = 78°

e. 5x + 80 = 180
5x = 180 - 80
= 100
x = 20°

7y = 80
y = 1,14°