Explanation:
(x1,y1) = (-2,5)
(x2,y2) = (5,-2)
(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y - 5)/(-2 - 5) = (x + 2)/(5 + 2)
(y - 5)/-7 = (x + 2)/7
(y - 5)/-1 = (x + 2)/1
y - 5 = -(x + 2)
y - 5 = -x - 2
y = -x -2 + 5
y = -x + 3
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