Two angles are supplementary supplementary if the sum of their measures is 180 degrees .180°. if the measure of an angle is 9 x9x degrees, represent the measure of its supplement supplement as an algebraic expression in x.

The answer is

Step-by-step explanation:

Two angles are supplementary if the sum of their measures is 180°. That means that two angles, let's say, α, and its supplement, β, are supplementary if the following is true:

Now, let's say that α measures 9x degrees, and let us replace in the above expression:

If we now want to represent the measure of the supplementary angle, β, we have to subtract 9x from both sides of the expression to get the final algebraic expression of β in x:

Note that an algebraic expression is just a mathematical relationship between numbers and variables! The goal was to isolate the supplementary angle, β, and find its relationship with the variable x.

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