rozwiąż układ równań: { 1/3x + y = 7/3
{ -x + y = 1
1/3x +y =7/3 I*3
-x + y =1
x +3y =7
------------
4y = 8 /:4
y = 2
y =2
-x + 2 =1
-x =1 -2
-x = -1/:(-1)
{x =1}
{y =2}
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1/3x +y =7/3 I*3
-x + y =1
x +3y =7
-x + y =1
------------
4y = 8 /:4
y = 2
y = 2
-x + y =1
y =2
-x + 2 =1
y = 2
-x =1 -2
y = 2
-x = -1/:(-1)
{x =1}
{y =2}