Which of the following is a parameterisation of the straight line passing through the points (7,0) and (2, -3 a) where a is a real number? Ox=7-5t, y=-3 at. Ox=2-7t, y=5t-3a. Ox=7-7t, y = (-3a-2) t. Ox=5t, y = 3at+2. Ox=(-3a-2) t+2, y=-7t-3 a.

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A: Please see the below picture for detailed solution.