Notice how y goes up 4 as each x goes up 1. This mean that the slope is 4 (4x). Now, notice how y is 0 when x is 1. You have to find y when x is 0. So, subtract 4 and you’ll get -4 (y is -4 when x is 0). So, the y-intercept is -4 (–4) while your slope is 4 (4x).
Therefore, your equation of the function will be y = 4x – 4.
