{y=2x-4
8-4x=-2y
{-2x=-4-y
8+2(-4-y)=-2y
{2y=4+y
8-8-2y=-2y
{2x=4+y
0=-2y
{2x=4+0/:2
y=0
{y=0
x=2
{x-5y-5=0
3x+y-1=0
{x=5y+5
y=-3x+1
{x=5(-3x+1)
y=-3x+1
{x=-15x+5
y=-3x=1
{16x=5
y=-3x+1
{x=5/16
y=1-3/4=1/4
6x - 5=4y
2-4y=-6x
6/4x - 5/4 = y
2- 4*(6/4x - 5/4) = -6x
6/4x - 5/4=y
2-6x +5 = -6x
6/4x - 5/4 = y
0=7
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