Question

Help please

Answer 1

Ответ:

z=15, y=6.

Объяснение:

Here is it

$\left \{ {{z=9+y} \atop {z-2y+2=5}} \right.$

$\left \{ {{z=9+y} \atop {(9+y)-2y+2=5}} \right.$

(9+y)-2y+2=5

9+y-2y+2=5

-y+11=5

-y=5-11=-6

y=6

z=9+y=9+6=15