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m ( x - x1 ) = y - y1
3 ( x + 4 ) = y - 2
3x + 12 = y - 2
3x - y + 14= 0
3x-y=-1
masukkan x dan y nya dan hilangkan yang ada di ruas kanan.
3x-y=3(-4)-2
3x-y=-12-2
3x-y=-14