3. (2022)-The straight line /₁ passes through the points P(-2, 1) and Q(4, -1). (a). Find the equation of ₁ in the form ax + by + c = 0, where a, b and c are integers. The straight line 12 passes through the point R(2, 4) and through the mid-point of PQ. (b). Find the equation of 12 in the form y = mx + c.

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