## Algebra 1: Common Core (15th Edition)

Use the slope formula $\frac{y_{1}-y_{2}}{x_{1}-x_{2}}$ to find the slope between each pair of points. $GH=\frac{(-2)-(-5)}{1-(-1)}=\frac{3}{2}$ $HI=\frac{(-5)-(4)}{(-1)-(5)}=\frac{-9}{-6}=\frac{3}{2}$ As both of them have the same slope of $\frac{3}{2}$, the points lie on the same line.