If the formula y x is changed by adding four (shown in red below), what effect would that change have on the function's values? f(x) = x+4 Select an answer What effect would it have on the graph? Select an answer It would shift all the points to the right four. It would scale all the points by a factor of four. It would have no effect. It would shift all the points up four. It would shift all the points to the left four. It would shift all the points down four.