Question

Dau coroana si multe puncte
Aveti ex in poza (ex 3)​

Answer 1

Răspuns:

x=3 , y=4

2x+y=10=>2·3+4=10 (A)

x-2y=-5=>3-2·4=3-8=-5 (A)

____________

x+y=7=>3+4=7 (A)

x+2y=10=>3+2·4=11 (F)

__________

-x+2y=-5=>-3+2·4=-3+8=5 (F)

3x+y=13=>3·3+4=9+4=13 (A)

_______

-2x+3y=6=>-2·3+3·4=-6+12=6 (A)

x-y=-1=>3-4=-1 (A)

doar pentru primul sistem solutiile date sunt reale