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y-y1/y2-y1 = x -x1/x2-x1
y-7/-1-7 = x-4/2-4
y-7/-8 = x-4/-2
(kalikan silang)
-2y+14 = -8x +32
-2y = -8x + 32 -14
-2y = -8x + 18
y = -8/-2x + 18
y = 4x + 18
..
titik (-3, k)
→ y = 4x + 18
k = 4(-3) + 18
k = -12 + 18
k = 6