Supplementary angles

One of the supplementary angles are three times larger than the other. What size is larger of supplementary angles?

Correct answer:

a =  135 °

Step-by-step explanation:


a+b = 180
a = 3b

a+b = 180
a = 3•b

a+b = 180
a-3b = 0

a = 135
b = 45

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