Question

Preciso ayuda!!!
3x+y+2z=9
2y-z=-1
y+3z=17

Answer 1

Respuesta:

x=-1.......y=2.........z=5

Explicación paso a paso:

2y-z=-1 multiplicamos x3   3(2y)-3(z)=3(-1) .....6y-3z=-3        +

y+3z=17...................................................................y+3z=17

7y=14  y=2   2+3z=17 .....3z=15.......z=5

3x+2+2(5)=9........3x+12=9    3x=-3     x=-1