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m = y1 - y2 dibagi x1 - x2 ------> m = (y1-y2)/(x1-x2)
- 1/4 = (h-7)/(4-(h+3))
-1 x (4 - (h+3)) = 4 x (h - 7)
-1 x (4-3 - h) = 4h -28
h - 1 = 4h -28
3h = 27
h = 9