Which is the graph of f(x) = log3x? On a coordinate plane, a logarithmic function approaches the y-axis in quadrant 1 and then approaches y = negative 1, in quadrant 4. It goes through (1, 0) and (3, negative 0. 5). On a coordinate plane, a logarithmic function approaches the y-axis in quadrant 4 and then increases into quadrant 1 and approaches y = 2. It goes through (1, 0) and (3, 1). On a coordinate plane, a logarithmic function approaches x = 2 in quadrant 4 and then increases into quadrant 1 and approaches y = 1. It goes through (3, 0).