Question

3x - y = 4
x + y = 2

Answer 1

$3x - y = 4 \\ x + y = 2 \\ \\ 4x = 6 \\ x = \frac{6}{4} = \frac{3}{2} \\ \\ x + y = 2 \\ \frac{3}{2} + y = 2 \\ mmc(2) = 2 \\ \frac{3 + 2y}{2} = \frac{4}{2} \\ 3 + 2y = 4 \\ 2y = 4 - 3 \\ 2y = 1 \\ y = \frac{1}{2}$