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{2x-0,5y=3
{4x-6=y
{2x-0,5(4x-6)=3
{4x-6=y
2x-2x+3=3
0=0
b)
{y+3/2x+6=0 tu brakuje drugiego równania
c)
{2x-8=4y /4
{-2y+x=-10
{y=½x-2
{-2(½x-2)+x=-10
-x+4+x=-10
0=-14
d)
{4-x=2y
{4-4y=2x /2
{4-x=2y
{x=2-2y
4-(2-2y)=2y
4-2+2y=2y
2y-2y=2
0=2