Let:
[tex]\begin{gathered} (x1,y1)=(-9,68) \\ m=-8 \end{gathered}[/tex]
Using the point-slope equation:
[tex]\begin{gathered} y-y1=m(x-x1) \\ y-68=-8(x-(-9)) \\ y-68=-8(x+9) \end{gathered}[/tex]
Solve for y:
[tex]\begin{gathered} y-68=-8x-72 \\ y=-8x-72+68 \\ y=-8x-4 \end{gathered}[/tex]
