8th Grade Math Worksheets Slope of a Line passing through Two Points Use the formula, m = (y 2 - y 1) / (x 1 - x 1) to find the slope (m) of a line passing through two points: (x 1 ,y 1) and (x 2 ,y 2 ). Solving Multi-Step Equations Follow the order of operations, rearrange to make the unknown variable the subject, and solve for its integer value.