Point Slope Form - Definition, Equation, Examples, Formula Point Slope Formula in Math: y − y 1 1 = m (x − x 1 1) where, (x, y) is a random point on the line (which should be kept as variables while applying the formula). (x 1 1, y 1 1) is a fixed point on the line. m is the slope of the line. Derivation of Point Slope Formula