Réponses

  • Utilisateur Brainly
2013-03-12T20:09:00+01:00

2x+3=4x+5

-2x=2

x=-1

 

2x-3=-4x+5

6x=8

3x=4

x=4/3

 

-2x+3=4x-5

-6x=-2

x=1/3

 

-2x-3=-4x-5

2x=-2

x=-1

 

2013-03-12T20:12:59+01:00

1) 2x+3 = 4x+5

    2x-4x = 5-3

   -2x = 2

     x = -1

2) 2x-3 = -4x + 5

    2x + 4x = 5 +3

    6x = 8

     x = 8/6=4/3

3) -2x+3=4x-5

     -6x = -2

      x = -2/-6

      x = 1/3

4) -2x-3=-4x-5

     -2x+4x = -5+3

     2x = -2

     x = -1