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y - 2 = 3(x-3)
y-2 = 3x - 9
y = 3x - 9 + 2
y = 3x - 7
atau 0 = 3x - 7 - y
= 3x - y - 7 = 0
x1 = 3
y1 = 2
pers garis => y-y1=m(x-x1)
y-2 = 3(x-3)
y = 3x -9 +2
y = 3x -7
jadi 3x -y = 7