Mathematics help needed with a complementary and supplementary angle problem

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4)The ratio of the measures of two supplementary angle is 4x-10/5x+1. Find the value of x.

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Nov 3rd, 2015

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4x-10/5x+1.

4x-10+5x+1= 180

supplementary angles equal 180 degrees

4x-10+5x+1= 180

9x-9= 180

9x= 189

x= 21

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Nov 3rd, 2015

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