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x - 2y = 22 / * - 2
2x + 3y = 24
- 2x + 4y = - 44
dodajemy stronami
2x - 2x + 3y + 4y = 24 - 44
7y = - 20
y = - 20/7 = - 2 6/7
x - 2y = 22
x - 2( - 20/7) = 22
x + 40/7 = 22 / * 7
7x + 40 = 154
7x = 154 - 40 = 114
x = 114/7 = 16 2/7
odp
x = 16 2/7 , y = - 2 6/7