On a coordinate plane, a curve labeled y = g (x) opens down and to the right. It approaches the y-axis in quadrant 4, and then increases up through (1, 2) and (10, 4). A curve labeled y = f (x) opens down and to the right. It approaches the y-axis in quadrant 4, and then increases through (1, 0) and (10, 1). Given the graphs of y = f(x) and y = g(x), g(x) = f(x) + _ expresses g(x) in terms of f(x).