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2x + y = 2
3x + 2y = -3
2x + y = 2 / *(-2)
3x + 2y = -3
-4x + -2y = -4
-x = -7
x = 7
2x+y = 2
2*7+y = 2
14 + y = 2
y = 2-14
y = -12
x = 7
y = -12
Sprawdzenie:
2 * 7 - 12 = 2
14 - 12 = 2