{2x-3y=1
{y-4x=2
{2x-3y=1
{y=2+4x
2x - 3 * (2 + 4x) = 1
2x - (6 + 12x) = 1
2x - 6 - 12x = 1
-10x - 6 = 1
-10x = 1 + 6
-10x = 7
x = -7/10
y = 2 + 4 * (-7/10)
y = 2 - 4 * 7/10
y = 2 - 2 * 7/5
y = 2 - 14/5
y = (2 * 5 - 14) / 5
y = (10 - 14) / 5
y = -4/5