Question
Write the supplement of an angle of measure $2y^\circ .$
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Answer
Let the required angle measures $x^{\circ}$. It is given that two angles measuring $x^{\circ}$ and $2 y^{\circ}$ are supplementary. Therefore, their sum must be equal to $180^{\circ}$. Or, we can say that: $x+2 y=180 x=180-2 y$ Hence, the required angle measures $(180-2 y)^{\circ}$
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