Question

Suppose that the augmented matrix of a system of linear equations for unknowns x, y, and z is

[1 0 -3 | -(9/4)
[4 1 -7 | -13
[-3 0 -9 | (27/4)

Find the solution.

Please help ASAP.

P.S- Sorry about the formatting. I could not figure out how to copy/paste the problem so I had to try and make it work haha.

THANK YOU!!!

Answer 1

Also, I made a typo. In the last row it should be (9) and not (-9)

Answer 2

SOLVE THE SYSTEM. PLEASE HELP

Answer 3

reduce it to echelon form

Answer 4

u know what is echelon matrix?

Answer 5

I know that I have to do that but I am not sure how to. I need this answer quickly! Can you tell me if this is correct or not?

x=-(9/4) y=-4 z=0

Answer 6

ya the echelon matrix is
1 0 -3 -9/4
0 1 5 -4
0 0 0 0
if u solve it z=0, y=-4,x=-9/4

Answer 7

Are you 100% positive? I have to get this correct and I just want to make sure. Also, I just want to make sure that you saw how i said the third number in the last row is 9, not -9. I just want to be sure haha

Answer 8

i think its ok

Answer 9

attached if it helps...?

Answer 10

That helps a lot! So when I write my answer would I write
x = -9/4 + 3z
y = -4 - 5z
z = 0

or just

x = -9/4
y = -4
z = 0


??

Answer 11

depends if u consider z to be zero or unknown, if z = 0 then both are correct, if z = unknown, then only the top series of answers is correct

Answer 12

Okay! Thanks so much everybody!