## moser90 Group Title Solve the system of equations using matrices. Use Gauss-Jordan elimination 3x-7y-7z = 7 6x+4y-3z=67 -6x-3y+z=-62 one year ago one year ago

1. across Group Title

Hint:$\begin{bmatrix} 3 & -7 & -7\\ 6 & 4 & -3\\ -6 & -3 & 1 \end{bmatrix}\begin{bmatrix} x\\ y\\ z \end{bmatrix}=\begin{bmatrix} 7\\ 67\\ -62 \end{bmatrix}.$

2. moser90 Group Title

so does x = 7

3. nincompoop Group Title

hmm

4. nincompoop Group Title

did you use Michael Jordan Elimination method to arrive at x=7?

5. moser90 Group Title

the book I am using is really confusing it says I have to get 1 on top but I don't know how

6. nincompoop Group Title
7. moser90 Group Title

I see how to do it when the number is 0 or 1 but I don't know how to start with the 3

8. psi9epsilon Group Title

@across almost gave you the cramers rule use it to find values of x, y, and z

9. nincompoop Group Title
10. moser90 Group Title

okay I used that but my answers I think are what is confusing me these are my choices a. {(7,1,7)} b. {14,7,-7)} c. {(-7,7,14)} d. {(7,7,1)}

11. across Group Title

If you have choices, all you have to do is substitute, I mean, slam-dunk them and check!

12. moser90 Group Title

I did that and none of them equal up

13. moser90 Group Title

that is the way they are

14. Hero Group Title

I'm interested in knowing that this Michael Jordan method is