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y-2 = 3x-9
y = 3x-9+2
y = 3x-7
-3x+y = -7
Lalu semua unsur dikali negatif 1. Jadi hasilnya 3x-y = 7 (B)
y - y = m ( x - x₁ )
y - 2 = 3 ( x - 3)
y - 2 = 3x - 9
y = 3x -9 + 2
y = 3x - 7
atau
3x -y = 7
jawabnnya B