Note that when x increases by 1, y increases by 4. Thus, the slope of the linear function representing this table is 4. What is the y-intercept? Note that as y decreases by 4, x decreases by 1. We have y = 1 and want the y-intercept, (0,y). Start with y=1 and subtract 4; the result is -3. So the y-intercept is (0,-3):
y = 4x - 3 (answer)