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3x+7y=-11 -5x-8y=11 Rezolvati urmatoarele sisteme de ecuatii​

Răspuns :

Răspuns:

3x+7y=-11 -5x-8y=11

3x+7y=11 /×5

-5x-8y=22 /×3

15x+35y=55

-15x-8y=66

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/ 27y=121

y=121/27

3x+7y=11 /×8

-5x-8y=22 /×7

24x+56y=88

-35x-56y=154

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-11x / =242

x=242:11

x=22