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{3(x-2)+y=5
{-(x+3)-4y=3
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Răspuns :

Dianageorgiana794

Răspuns:

[tex]\left \{ {{3x-6+y=5} \atop {-x-3-4y=3}} \right. \\\\\left \{ {{3x+y=5+6} \atop {-x-4y=3+3}} \right. \\\\\left \{ {{3x+y=11} \atop {-x-4y=6/*3}} \right. \\\\\left \{ {{3x+y=11} \atop {-3x-12y=18}} \right. \\\\-11y=29= > y=-29/11\\\\3x+(-29/11)=11= > 3x=11+29/11\\ \\x=\frac{11*11+29}{11} *1/3=150/11*1/3= > x=50/11[/tex]

Iulinas2003

Răspuns:

Explicație pas cu pas:

3x-6+y=5

-x-3-4y=3

3x+y=5+6=11    ,   3x+y=11    (1)

x+4y= -6                        (2)

inmultesc ec.2 cu 3

3x+12y=- 18

3x+y=11

scad ec 2 din prima

11y=-29

y=- 29/11

3x-6-29/11=5

3x=11+29/11=(121+29)/11=150/11

x=150/33 =50/11

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