If a ∈ n, and three points a (a, 0), B (0, a + 4) and C (1, 3) are collinear, find the value of A

∵ a, B and C are collinear ∵ the slopes of AC and BC are equal ∵ 3 − 01 − a = 3 − (a − 4) 1 − 0. The solution is a = ± 2

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