Question

Va rog urgent!!!!!!!!!!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

{-4x-y = -1   I·2  

{x+2y = 2 =>

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{-8x-2y = -2

{x+2y = 2

=========

-7x = 0 => x = 0

=> 2y = 2 => y = 1

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{5x-8y = 20

{3x+2y = -22   I·4 =>

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{5x-8y = 20

{12x+8y = -88

===========

17x = -68 => x = -68/17 => x = -4

3·(-4)+2y = -22 => 2y = -22+12 =>

2y = -10 => y = -10/2 => y = -5

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{3x-2y = 1   I·3

{5x+3y = 8  I·2 =>

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{9x-6y = 3

{10x+6y = 16

==========

19x = 19 => x = 19:19 => x = 1

3-2y = 1 => 2y = 3-1 = 2 => y = 1