(1; 3), (-2; 2)
x-x1/x2-x1 = y-y1/y2-y1
x-1/-2-1 = y-3/2-3
x-1/-3 = y-3/-1 |•(-1)
x-1/3 = y-3/1
3(y-3) = x-1
3y-9-x+1 = 0
3y-x-8 = 0
(1; 3), (-2; 2)
x-x1/x2-x1 = y-y1/y2-y1
x-1/-2-1 = y-3/2-3
x-1/-3 = y-3/-1 |•(-1)
x-1/3 = y-3/1
3(y-3) = x-1
3y-9-x+1 = 0
3y-x-8 = 0