## Geometry: Common Core (15th Edition)

Use the midpoint formula. Substitute the given values. $M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})=(\frac{13+(-6)}{2},\frac{8+(-6)}{2})=(\frac{7}{2},\frac{2}{2})=(3.5,1)$