I noticed you guys didn’t help the other person out with this question and I need help as well.

Question

What is the solution of the system of equations?

{-3x - 4y - 3z = -7

{2x - 6y + 2z = 3

{5x - 2y + 5z = 9

A. (5,-2,7)

B. (-5,2,7)

C.(5,2,-7)

D. No solution

Use a matrix to find the solution to the system of equations.

{-8x - 8y = -16

{6x - 9y = -108

A.(-6,8)

B.(6,8)

C.(8,-6)
D. (6,-8)

Answer 1

Someone might check your answers. However, Jiskha tutors do not do the work for you.

Answer 2

I don’t know the freaking answer so how am I supposed to to provide answers???? WHY WONT ANYONE HELP ME! I guess the first one is C and the second one is B

Answer 3

Back when I was in school, if we didn't know the answer, we went back through the text and tried to learn how to do the problem.

Answer 4

Ok obviously it’s not in text because I’m asking for help on here

Answer 5

No, it's not obvious at all. What school do you attend? Why is the teacher giving you an assignment if s/he hasn't taught it and it's not in the text?

Answer 6

I don't know of a single text that would not show an example of how to solve a system of 3 equations in 3 unknowns, if that is the topic of the chapter.
Looking at your equations, it would be easiest to solve by elimination.
Eliminate the y variables using #1 and #3. Multiply #3 by 2, then subtract from #1, giving you a new equation containing only x's and z's.
Then multiply #3 by 2, then subract it from #2, giving you a second equation in only x's and z's
After that use your method of solving 2 equations in 2 unknowns, that you must have learned earlier.

As to the 2nd problem, what method of matrix manipulation have your learned?
- using an inverse matrix ?
- Gauss-Jordan ?
- some other matrix method?