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3 years ago

13

Math help will give brainliest what is X and M angle A

1 answer:

Anna [14]3 years ago

3 0

Supplementary = 180 degrees...

A + B = 180

3x + 12 + 7x + 38 = 180

10x + 50 = 180

10 x = 130

x = 13

To find the A just substitute x in...

3 ( 13) + 12

A = 51

To check substitute the x..

A + B = 180

3(13) + 12 + 7(13) + 38 = 180
51 + 129 = 180
180 = 180

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