Explanation:
step 1. pick one of the points: (-2, 5)
step 2. calculate the slope of the points (-2, 5) and (1, -1). m = (-1 - 5)/(1 - (-2)) = -6/3 = -2
step 3. plug them in: y - y1 = m(x - x1) = y - 5 = -2(x - (-2)).
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