The midpoint of a segment can be found using the formulas for a directed line segment, x = (x2 – x1) x1 and y = (y2 – y1) y1. when using these formulas to find a midpoint, which is true? a = 1 and b = 2 a = 2 and b = 1 a = 1 and a b = 2 a = 2 and a b = 2