y - y1 = m(x - x1), where (x1, y1) is a known point on the line and 'm' is the gradient, used to represent a straight line on a graph.
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Two-Point Form of a Straight Line Equation
(y - y1) / (x - x1) = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two known points on the line, used to represent a straight line on a graph.