Answer:
m = 1 (the slope is 1/1) b = -4 (the y-intercept is (0,-4))
Explanation:
First, you have to plot a point at the y-intercept (0,-4). Then go up once and to the right once (since the slope is 1/1). Keep doing this as much times as you want and connect the dots to form a line. See image below.