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koordinat = (2,8) dan (4,14)
y - y1 = x - x1
y2-y1 x2-x1
_y - 8_ = x - 2
14 - 8 4 -2
_y - 8_ = x - 2
6 2
2y - 16 = 6x - 12
2y = 6x - 12 + 16
2y = 6x + 4
y = 3x + 2
masukkan nilai 11 ke x
y = 3(11) + 2
y = 33 + 2
y = 35
jadi nilai a = 35