Question

Calculati: sistemul x-2y=7; 2x+y=-1 prin ambele metode

Va rog repede!!​

Answer 1

Răspuns:

x-2y=7

2x+y=(-1) |•2

x-2y=7

4x+2y=(-2)

________

5x / = 5 =>x=1 =>y=(-3)

x=7+2y

2(7+2y)+y=(-1) ; 14+5y=(-1) ; 5y=(-15) =>y=(-3) =>x=1