Supplementary angles add up to 180
so angle 1 + angle 2 = 180
so 11x - 15 + 5x - 13 = 180
16x - 28 = 180
16x = 208
x = 13
check: 11(13) - 15 = 128
5(13) - 13 = 52
180
Nathan S.
asked 11/05/20supplementary angles = 180 °
Supplementary angles add up to 180
so angle 1 + angle 2 = 180
so 11x - 15 + 5x - 13 = 180
16x - 28 = 180
16x = 208
x = 13
check: 11(13) - 15 = 128
5(13) - 13 = 52
180
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