Which function is graphed below? on a coordinate plane, an exponential decay function is shown. The curve starts in quadrant 2 and decreases into quadrant 1. It crosses the y-axis at (0, 3) and approaches y = 0 in quadrant 1. Y = one-third (3) superscript x y = 3 (one-third) superscript x y = (one-half) superscript x baseline + 2 y = (2) superscript x baseline minus 1.