The equation for finding the coordinates of one endpoint ( B) of a straight line AB given the coordinates of the other ( A) and its midpoint M is: where ( xA, yA) are the coordinates of point A, ( xB, yB) are the coordinates of point B, and ( xA, xA)

Assuming you have an endpoint A = (x₁, y₁) and midpoint M = (x, y): Double midpoints' coordinates: 2x, 2y. Subtract the x-coordinate of the known endpoint from the first value to get the x-coordinate of the missing endpoint: x₂

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To find midpoint you add your points and divide by two, so to find an endpoint you only need to do the opposite, double the midpoint and subtract the endpoint: x-value: 5 (2) - 2 =