Kelsey graphed the equation y = 3x + 1 as shown below. On a coordinate plane, a line goes through points (negative 3, 0) and (0, 3). Which describes Kelsey’s error? Kelsey graphed the y-intercept on the x-axis. Kelsey graphed –3 instead of 3 as the y-intercept. Kelsey graphed the slope as up 1 right 1 instead of up 1 left 1. Kelsey graphed the slope as the y-intercept and the y-intercept as the slope.