Oblicz układ równań:
x +y = 13
9x - 9y = 27 /:9
x + y = 13
x - y = 3
----------------
2x = 16
x = 8
8 + y = 13
y = 13 -8
y = 5
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x +y = 13
9x - 9y = 27 /:9
x + y = 13
x - y = 3
----------------
2x = 16
x = 8
x + y = 13
8 + y = 13
y = 13 -8
y = 5
x = 8
y = 5