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y - y1 = x - x1
y2-y1 x2-x1
y - 14 = x - 4
8 - 14 2 -4
y - 14 = x - 4
-6 -2
-2y + 28 = -6x + 24
-2y = -6x + 24 - 28
-2y = -6x - 4
2y = 6x + 4
y = 3x + 2
(11,a) masukkan nilai 11 ke nilai x
y = 3(11) + 2
y = 33 + 2
y = 35