Write slope intercept form general for the equation
y = mx + b
in this equation m = Y/X.
Y = y - y'
X = x - x'
then find m
m= (-7 -5)/ (-1 -2) = -12/-3 = 4
then equation becomes
y = 4x + b
b = y - 4x . Replace (x,y) = ( -1,-7)
b= -7 -4•(-1) = -3
Then finally eqaution of that line is
y = 4x -3
