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{2x - 1/2y =3
{y - 4x =6 -> y = 6+4x
{2x -½*(6+4x) =3
{y = 6+4x
{2x -3-2x =3
{y = 6+4x
{0=3
{y = 6+4x układ równań sprzeczny
b)
{6x + y =3 -> y = 3-6x
{3x +½y =5
{y = 3-6y
{3x +½*( 3-6x)=5
{y = 3-6y
{3x +³/₂-3x=5
{y = 3-6y
{0=3½ układ równań sprzeczny