Question

Solve the system of equations:
x+2y+3z=9
2x-y+2z=11
3x+4y-2y=-4

Answer 1

u know Cramer's Rule?? though its gonna be long @AEB047

Answer 2

No...

Answer 3

put it in an augmented matrix and use elementary row operations to put it in ref or rref

Answer 4

I forget how to do anything with matrices except set them up.

Answer 5

\[x = \frac{ D_1 }{ D }\]
\[y = \frac{ D_2 }{ D }\]
\[z = \frac{ D_3 }{ D }\]

Answer 6

@AEB047 THTS THE CRAMER'S RULE

Answer 7

Thanks.

Answer 8

yw....or else do it by elimination method....its also gonna be lengthy ...... @AEB047

Answer 9

I've already tried that.

Answer 10

@AEB047 u didn't get the answer tht way?????o_O

Answer 11

The answers never work for all three equations!

Answer 12

hmmmmm really ,.....i got the answers by both process...want help in tht one or Cramer's one is good???

Answer 13

I've never done the Cramer thing before, so maybe some help with the other method would work better.

Answer 14

ok...:)

Answer 15

@AEB047

Answer 16

What do you mean by multiply eq 1 from 2? I don't understand how you got equation 4.

Answer 17

hmmhmmmm i did tht to eliminate "x" from both equations....u give a try
how would u eliminate "x" from equation 1 and 2

Answer 18

Multiply equation 1 by 5

Answer 19

Sorry, -5

Answer 20

and?????????

Answer 21

i tell u multiply eq 1 by 2
and eq 2 by -1 and add the new equations u get ..........

Answer 22

Okay, I think I get it now. One moment...

Answer 23

okay hav it :))) lol

Answer 24

I've done this all before, actually and I got (2, -1, 3) and it doesn't work in the third equation.

Answer 25

the third equation is 3x + 4y - 2z = -4
u hav written here "3x + 4y - 2y = -4"

Answer 26

and hey @AEB047 (2 , -1 , 3) is the answer ........:)))

Answer 27

Wait, it does work!!!

Answer 28

hmmmmm yes ........

Answer 29

@AEB047 so u done with it????o_IO

Answer 30

Yeah, thanks

Answer 31

u r most welcome....