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(2x + 13 derajat) + (x + 3y derajat) = 180 - 50
= 130
berarti masing - masing sudutnya adalah 65.
maka, 2x + 13 derajat = 65
2x = 65 - 13
= 52
x = 26
lalu, x + 3y derajat = 65
26 + 3y derajat = 65
3y derajat = 65 - 26
= 39
y = 13
jadi, x dan y = 26 dan 13