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[Metoda podstawiania]
{x+3y=5
{2x-y=3
---
{x=5-3y
{2*(5-3y)-y=3
---
{x=5-3y
{10-6y-y=3
---
{x=5-3y
{-7y=3-10
---
{x=5-3y
{-7y=-7 |:(-7)
---
{x=5-3y
{y=1
---
{x=5-3*1
{y=1
---
{x=5-3
{y=1
---
{x=2
{y=1
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zad 2