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(2,3) berarti x1 = 2 , y1 = 3
(4,5) berarti x2 = 4 , y2 = 5
Persamaan garis l yang melalui titik (2,3) dan (4,5) adalah :
y - y1/y2 - y1 = x - x1/ x2 - x1
y - y1/y2 - y1 = x - x1/ x2 - x1
y - 3/5 - 3 = x - 2/ 4 - 2
y - 3/2 = x - 2/2
2 (y-3) =2 (x - 2)
2y - 6 = 2x - 4
2y - 2x = -4 + 6
2y - 2x = 2