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Titik potong dengan sumbu x (maka y = 0)
y = -3x + 12
0 = -3x + 12
3x = 12
x = 12 : 3
x = 4 ==> koordinat (4,0)
Titik potong sumbu y (maka x = 0)
y = -3x + 12
y = -3.0 + 12
y = 12 ===> koordinat (0,12)