SOLUTION: what is the value of x in the solution of the system? -3x-y+2z=7 2y+z=-5 3x+6y=-21 A.-4 B.3 C.-2 D.1

SOLUTION: what is the value of x in the solution of the system? -3x-y+2z=7 2y+z=-5 3x+6y=-21 A.-4 B.3 C.-2 D.1

Algebra.Com

Question 994607: what is the value of x in the solution of the system?
-3x-y+2z=7
2y+z=-5
3x+6y=-21
A.-4
B.3
C.-2
D.1
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Add the 1st and 3rd equations,

Now multiply the second equation by and add to this last equation,

So then,

RELATED QUESTIONS
CRAMER RULE, ELIMIATION OR SUBSTITUTION METHOD, AND MATRICES PRACTICE PROBLEMS 1. (answered by richard1234)

Solve each of these system of equations. 1) x + 2y + z = 10 2x - y + 3z = -5 (answered by Alan3354)

A student is solving the system of equations below. In which line is a mistake first... (answered by ikleyn,fractalier)

Solve the following system of equations. what is the value of z? x+y+z=1 2x-y+3z=-7... (answered by scott8148)

I've missed a lot of school because I've been sick and I'm trying to get all of my work... (answered by jsmallt9)

6.1 I. Solve each system by graphing, and classify the system as dependent or... (answered by Flake)

Determine which pair is a solution of the system 3x + 2y = 5 -3x - y = -12 A.... (answered by fractalier)

1. What is the formula for the determinant of a 3 x 3 matrix ? A. B.... (answered by richard1234)

1.Solve the linear equation : 2x+y-3z= 5,3 x-2y-2z= 5, and 5x-3y-z= 16. a.(1 , 3 ,... (answered by Vladdroid)