Question 847219
Find the slope.

{{{m =  (8-4)/(-8-7) =  -4/15}}}

Find the y-intercept

y = mx +b    

4 = (-4/15)*7 + b

4 = -28/15 + b

4 + 28/15 = b

88/15 = b

We now have  y = -4/15 x  + 88/15

Multiply both sides by 15.

15y = -4x + 88

4x + 15y = 88  <---- standard form