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Verified answer
(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)(y - 1)/(5 - 1) = (x - 2)/(4 - 2)
(y - 1)/4 = (x - 2)/2
y - 1 = 2x - 4
y - 2x = -3
y-1/ 5-1 = x-2/4-2
y-1/4 = x-2/2
2(y-1)= 4(x-2)
2y -2 = 4x-8
2y -4x = -6
y-2x = -3 (D)