x+3y-12=0 metoda podstawiania tez potrzebne na zaraz
2x-y-3=0
{x+3y-12=0
{2x-y-3=0
{x=12-3y
{2(12-3y)-y=3
{24-6y-y=3
{-7y=-21 /:3
{y=3
{x=12-3*3
{x=3
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{x+3y-12=0
{2x-y-3=0
{x=12-3y
{2(12-3y)-y=3
{x=12-3y
{24-6y-y=3
{x=12-3y
{-7y=-21 /:3
{x=12-3y
{y=3
{x=12-3*3
{y=3
{x=3
{y=3