## Geometry: Common Core (15th Edition)

Use the vertical angle theorem to write an equation and solve for y. $3y+20=5y-16\longrightarrow$ vertical angles have the same measure $3y+36=5y\longrightarrow$ addition property of equality $36=2y\longrightarrow$ subtraction property of equality $18=y\longrightarrow$ division property of equality