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tergantung pilihan
y = -2x+15
2x = -y +15
y=-2x-7
gradien= -2
y-y₁=m (x-x₁)
y-3= -2 (x-4)
y-3=-2x+8
y=-2 x +8
-3
-3y=-2x+8
2x-3y-8=0