Question

X-y +32=4
2x+y-z=5
y +2z=0​

Answer 1

y=122/7

Explicación paso a paso:

X-y +32=4 ; 32-4=y-x ; 28=y-x  

2x+y-z=5 ; 2x+y=5+z ;  

y +2z=0​ ; 2z=-y; z=(-y/2)

2x+y=5-y/2; 4x+2y=10-y; 4x+3y=10

28=y-x   4x+3y=10

x=y-28 ; 4(y-28) + 3y= 10

4y- 112 +3y=10

7y=122

y=122/7