# Algebra

posted by
**Mary** on
.

What is the value of x in the solution of this system?

-3x-y+2z = 7

2y+z= -5

3x+6y= -21

4

2

1

3

posted by
**Mary** on
.

What is the value of x in the solution of this system?

-3x-y+2z = 7

2y+z= -5

3x+6y= -21

4

2

1

3