Question

Foar a și b repede dau coroana pt raspunsu corect​

Answer 1

Răspuns:

a.

10x-7y=-18 I×4

-4x+5y=16 I×10

__________

40x-28y=-72

-40x+50y=160

____________

  /        22y=88=>y=88:22=>y=4

10x-7×4=-18

10x=-18+28

x=10:10=>x=1

b.

5x-4y=-23 I×3

7x+6y=-9 I×2

__________

15x-12y=-69

14x+12y=-18

____________

29x    /   = -87=>x=-87:29=>x= -3

5×(-3)-4y=-23

-4y=-23+15

y=8:4=>y=2