The coordinates of three points are A(6, 4), B(4, 6) and C(10, 7). a. Find the gradient

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The coordinates of three points are A(−6, 4), B(4, 6) and C(10, 7).

a. Find the gradient of AB and the gradient of BC.

b. Use your answer to part a to decide whether or not the points A, B and C are collinear.

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