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(-8 - 0) / (3 - (-1)
= -8 / 4
= -2
y = -2x + c
Ketika x = 3 y= -8
jadi
-8 = -2(3) + c
-8 = -6 + c
-8 + 6= c
-2 = c
jadi garis yang melewati 2 titik tersebut ialah y=-2x - 2