Question 357095
Plug:
(-1, -5), -8
into the "point-slope" form:

y - y1 = m(x - x1)

y - (-5) = -8(x - (-1))

y + 5 = -8(x + 1)

y + 5 = -8x - 8

y = -8x - 13 (this is what they're looking for)