Umiecie rozwiązać to równianie?
2x+y=5
x+2y=7
x+2y=7 / *(-2)
2x + y = 5
-2x - 4y = -14
----------------- dodajemy stronami
-3y = - 9 / :(-3)
y = 3
2x + 3 = 5
2x = 5-3
2x = 2
x = 1
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2x+y=5
x+2y=7 / *(-2)
2x + y = 5
-2x - 4y = -14
----------------- dodajemy stronami
-3y = - 9 / :(-3)
y = 3
2x + 3 = 5
2x = 5-3
2x = 2
x = 1
y = 3