Explanation:
first mark your points
(-1,3) (-4,0)
x1 y1. x2 y2
solve with given points using the formula:
y2-y1/x2-x1
=
0-(3)
-4-(-1). = -3/-3 = 1 (slope)
plug slope and one pair of points into (y=mx+b)
(0) = -4(1)+b
=-4+b
4=b
add everything together:
y=x+4