SOLUTION: suppose∠x and∠Y are supplementary angles, If∠X=x2-9x and∠Y=11x+12 find the value ofX, m∠x and m∠Y

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Question 1146244: suppose∠x and∠Y are supplementary angles, If∠X=x2-9x and∠Y=11x+12 find the value ofX, m∠x and m∠Y
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2-9x%2B11x%2B12=180

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Angles X and Y are supplementary, so the sum of their measures is 180 degrees.
Measure for angle X given as x^2-9x. Measure for angle Y given as 11x+12.

meas. angle X plus meas. angle Y is 180 degrees.
%28x%5E2-9x%29%2B%2811x%2B12%29=180;
the algebra from here is straightforward.

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Clearly in the description, X is used for refering to an angle according to a point; and x is a numeric variable. m∠x is wrong.