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The gradient of the line joining the points (x1, y1) and (x2, y2) is:

A(y2 - y1) / (x2 - x1)

B(x2 - x1) / (y2 - y1)

C(y2 + y1) / (x2 + x1)

D(y2 - x2) / (y1 - x1)