Question

A : 2x+y=6 (1)
x-y=12. (2)

B: 5x-2y+2=24
2x+5y-2=12

C : 12x+y=34
14x+y=15

Answer 1

ejercicios.

a) x=6. y=-6

b) x=138/29. y=26/29

c) x=-9.5. y=148