## Geometry: Common Core (15th Edition)

Let $x$ be the measure of the supplement. The measure of the angle is $2x+3$. $\overset{twice}{2x}\underset{three\ more\ than}{+3}$. $x+(2x+3)=180\longrightarrow$ definition of supplement $3x+3=180\longrightarrow$ combine like terms $3x=177\longrightarrow$ subtraction property of equality $x=59\longrightarrow$ division property of equality Use substitution to find the measure of the angle. $2x+3=2(59)+3=118+3=121$