If the formula y = a is changed by adding three as shown in red below. Which of the following best describes the resulting change for each of the functions? Function f(z) = (2+3)3 - f (x) = 23+3 Transformation a. The +3 would directly affect the x-values, so the graph would shift horizonally. b. The +3 would have no effect. c. The +3 would directly affect the y-values, so the graph would shift vertically