[tex]\begin{gathered} \text{mid point = (}\frac{x_1+x_2}{2},\frac{y_1+y_2}{2}\text{)} \\ x_1=12 \\ y_1=6 \\ (-4,8)\text{ = (}\frac{12_{}+x_2}{2},\frac{6_{}+y_2}{2}\text{)} \\ -4=\frac{12+x_2}{2} \\ -8=12+x_2 \\ -8-12=x_2 \\ x_2=-20 \\ \\ 8=\frac{6+y_2}{2} \\ 16=6+y_2 \\ 16-6=y_2 \\ y_2=10 \\ (x_{2,}y_2)=(-20,10) \end{gathered}[/tex]
