Please help me It's math I will give you extra points.
Answer:
[tex] \frac{y_ 2 - y_ 1 }{x_ 2 -x_ 1 } = \frac{y - y_ 1}{x - x_ 1} \\ \frac{10 - 7}{2 + 1} = \frac{y - 7}{x + 1} \\ \frac{y -7}{x + 1} = 1 \\ y -7 = x + 1 \\ x-y=-8[/tex]