[tex]2x - y = 3 \\ - 2y = 3 \\ y = 3 \div - 2 \\ y = \frac{3}{ - 2} \\ y = - \frac{3}{2} [/tex]
[tex]4x2 - 3y2 = 1 \\ 8x - 3 \times 2y = 1 \\ 8x = - 6y = 1[/tex]