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2x - 4y = -6
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6x + 4y = -20
2x - 4y = -6
----------------- dodajemy stronami
8x = -26
x = -26 : 8 = - 3,25
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4y = 2x + 6 = 2*(-3,25) + 6 = -6,5 + 6 = -0,5 / : 4
y = - 0,125
Odp. x = - 3,25 , y = - 0,125
============================
y = 2x -3
3x + y = 9
-------------------
3x +(2x -3) = 9
5x - 3 = 9
5x = 9 +3 = 12
x = 12 : 5 = 2,4
y = 2*2,4 - 3 = 4,8 - 3 = 1,8
Odp. x = 2,4 , y = 1,8
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