Question

Rezolvati prin metoda substitutiei urmatoarele sisteme:
3x-y=-4
x-3y=-4

4x=9y=21
12x=15y=51
va rog ajutatimaaaaaaaaaaaaaaaaaa


8x-y=-15
-x+8y=-6

10x+27y=10
-25x+12y=-25

1-4x=y
2-y=x+y

2x-3y=4
-8x+12y=8

Answer 1

Am atasat rezolvarile a doua si ultima nu au solutii!