Geometry: Common Core (15th Edition)

$(11,-13)$
Use the midpoint formula to find $x_2$. $M=\frac{x_1+x_2}{2}$ $4=\frac{-3+x_2}{2}$ $4\times2=\frac{-3+x_2}{2}\times2$ $8=-3+x_2$ $8+3=-3+x_2+3$ $11=x_2$ Use the midpoint formula to find $y_2$. $M=\frac{y_1+y_2}{2}$ $-9=\frac{-5+y_2}{2}$ $-9\times2=\frac{-5+y_2}{2}\times2$ $-18=-5+y_2$ $-18+5=-5+y_2+5$ $-13=y_2$