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If the degree measure of an angle is 40° less than 3 times the degree measure of its supplementary angle, what is the degree measure of the angle?

Respuesta :

mreijepatmat
Let x° be this angle and it's supplementary angle is 180°-x°;
Now translate English into Mth language:

x° = 3(180°-x°) - 40°

Solve for x°: x° = 540° - 3x° - 40°

4x° = 500°   and x° =125°

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