[tex]4x - 6 = y \\ x + 2y = 6 \\ \\ x + 2(4x - 6) = 6 \\ x + 8x - 12 = 6 \\ 9x = 6 + 12 \\ 9x = 18 \\ x = 18 \div 9 \\ x = 2 \\ \\ y = 4 \times 2 - 6 = 8 - 6 = 2 \\ \\ x - y = 2 - 2 = 0[/tex]
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[tex]4x - 6 = y \\ x + 2y = 6 \\ \\ x + 2(4x - 6) = 6 \\ x + 8x - 12 = 6 \\ 9x = 6 + 12 \\ 9x = 18 \\ x = 18 \div 9 \\ x = 2 \\ \\ y = 4 \times 2 - 6 = 8 - 6 = 2 \\ \\ x - y = 2 - 2 = 0[/tex]