Răspunsuri

  • Utilizator Brainly
2014-05-03T19:48:41+03:00
4x-20=-3y-3y=2y-2
4x-20=-9y-2y=-2
4x-20=-11y=-2
4x-11y=20-2
4x-11y=18
Nustiu sigur cat de bine e  ,Sper ca te-am ajutat!

2014-05-03T22:01:26+03:00

4 x+3y=20  si

 -3y=2y-2  am facut inmultirile   =>-3y-2y=-2   =>- 5y= - 2   =>simplific in ambii termeni cu -1   =>   y=2/5

4x+3* 2/5=20  =>4x+15/2=20   =>4x=20-15/2  amplific pe 20 cu 2 pt a ajunge la acelasi numitor  =>4x=40/2-15/2=25/2   =>4x=25/2       8x=25   => x=25/8