Question

x-4y=9, 2x-y=4.......................................................................

Answer 1

Respuesta:

x-4y=9

x=9+4y...(1)

2x-y=4....(2)

(1) en (2)

2(9+4y)-y=4

18+8y-y=4

18+7y=4

7y= -14

y= -2 x=1