A-Level Maths Revision notes 2014

2 Coordinate Geometry The Basics: Find the distance between two points using Pythagoras' theorem. The midpoint is the average (mean) of the coordinates. The gradient = Parallel lines have the same gradient. The gradients of perpendicular lines have a product of -1. Straight Lines: Equation of a straight line is y = mx + c, where m = gradient, c = y-intercept. ................
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