Question

use crammers rule to solve for x, y and z in:
x - 5y + 3z = 15
2x + 4y +7z = 34
x - y = 15 + 2z

Answer 1

Why not just row reduce?

Answer 2

http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e43b0ea0b8b32e1c74c3197

Answer 3

i want a step-by-step solution. preparing for an exam tomorrow and kind of a bit saturated now. help please.

Answer 4

A step by step solution to calculating a determinant?

Answer 5

to solve a 3x3 matrix.

Answer 6

what are the answers to x, y and z?

Answer 7

You do know that in all cases row reduction is much faster. If your teacher isn't asking you to use a specific method you should row reduce.

Answer 8

he mentioned crammers rule. how do u row-reduce wt crammers rule?

Answer 9

It's explained step by step in the link I gave u...

Answer 10

http://en.wikipedia.org/wiki/Gaussian_elimination

Answer 11

He want's Cramer's rule...

Answer 12

pls help confirm Im correct so far: D= -74, Dx = 248, Dy= -20 AND Dz = -16

Answer 13

yes, he says to use crammers rule to solve.

Answer 14

Fine

Answer 15

I agree it's a waste of time and energy...

Answer 16

Learn crammers rule but tell your teacher that its inefficient and he should accept the answer by using row reduction.

Answer 17

my solution?

Answer 18

Now just divide each one by D...

Answer 19

he gave the question when he was teachin us matrices in class.

Answer 20

was my solution correct?

Answer 21

I assume so, I am not going to check simple numerical calculations......

Answer 22

anyways, i appreciate your time. but how do you row-reduce?

Answer 23

What did you get for x, y, z?

Answer 24

U can enter matrices into Wolfram like this to check determinants

http://www.wolframalpha.com/input/?i=Det+%28%281%2C-5%2C3%29%2C%282%2C4%2C7%29%2C%281%2C-1%2C2%29%29

Answer 25

What did you get for x, y, z?

It is up above...

Answer 26

x=-3.35
y=0.27
z=0.22

Answer 27

\[\left[ \begin {array}{cccc} 1&0&0&{\frac {581}{37}}
\\0&1&0&{\frac {10}{37}}\\ 0&0&1&
{\frac {8}{37}}\end {array} \right]
\]

Answer 28

Your solution is not correct.

Answer 29

i guessed as much.

Answer 30

this looks complicated.