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Rezolvați sistemele
2x-5y=11
3(x+y)-2x=11

2(x+3)-3y=2
5x-3(2y-1)=-4

Răspuns :

Slavitescudora

1) 2x-5y=11

3x+3y-2x=11

2x-5y=11

x+3y=11 /*(-2)

2x-5y=11

-2x-6y= -22

---------------- (+)

/ -11y= -11 => y=1

2x-5=11 => 2x=16 => x=8

2) 2x+6-3y=2

5x-6y+3= -4

2x-3y= -4 / *(-2)

5x-6y= -7

-4x+6y= 8

5x-6y= -7

.................. (+)

x +/ = 1 => x=1

2-3y= -4 => 3y= 6 => y=2