Rozwiąż algebraicznie układ równań:
{x+3y=2
{2x-y=-3
x = 2 - 3y
2 * (2 - 3y) - y = -3
4 - 6y - y = -3
-7y = -7 /:-7
y = 1
x = 2 - 3
x = -1
{x+3y=2 / *(-2)
{-2x-6y=-4
-7y = -7
y=1
x+3y = 2
x=2-3y
x=2-3*1
x=-1
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{x+3y=2
{2x-y=-3
x = 2 - 3y
2 * (2 - 3y) - y = -3
x = 2 - 3y
4 - 6y - y = -3
x = 2 - 3y
-7y = -7 /:-7
x = 2 - 3y
y = 1
x = 2 - 3
y = 1
x = -1
y = 1
{x+3y=2 / *(-2)
{2x-y=-3
{-2x-6y=-4
{2x-y=-3
-7y = -7
y=1
x+3y = 2
x=2-3y
x=2-3*1
x=-1