What happens to a line when the y-intercept is changed? check all that apply. a. as the y-intercept increases, the graph of the line shifts right. b. as the y-intercept decreases, the graph of the line shifts down. c. as the y-intercept decreases, the graph of the line shifts left. d. as the y-intercept increases, the graph of the line shifts up. e. as the y-intercept decreases, the graph of the line gets less steep.