Answer
not perpendicular
Work Step by Step
m=$\frac{y_2-y_1}{x_2-x_1}$
m=$\frac{-6-6}{-1-2}$
m=$\frac{-12}{-3}$
m=4
m=$\frac{y_2-y_1}{x_2-x_1}$
m=$\frac{-1-2}{-8-4}$
m=$\frac{-3}{-12}$
m=$\frac{1}{4}$
4$\times$$\frac{1}{4}$=1$\ne$-1
Therefore, these lines are not perpendicular.
