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3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
13 = 12x - 2y Adding 2y to both sides: 13 + 2y = 12x Subtracting 13 from both sides: 2y = 12x - 13 Divide both sides by 2: y = 6x - 6.5
2y = 4x + 4y = 2x + 2
6x+2y=4 gives y=2-(1/3)x