Posted by **Max** on Saturday, November 13, 2010 at 8:06pm.

Solving systems of linear equations in 3 variables...

1) 3x-2y+2z=1

2) 2x+5y-5z=7

3) 4x-3y+z=-3

I combined 1 and 3 to get -5x+4y=7

And then i combined 2 and 3 to get

-13y+11z=-17. Can that be right? how would you combine those two equations?

- Algebra -
**bobpursley**, Saturday, November 13, 2010 at 8:09pm
you should when combining 2 and 3, multiply to get rid of z, so multiply 3 by 5, then add.

- Algebra -
**Reiny**, Saturday, November 13, 2010 at 8:13pm
You would like to have the same two variables in the two new equations.

Your first one contains x and y, but your second contains y and z. This gets you nowhere.

Your first equation is ok,

Now take 5 times the third and add it to the second.

- Algebra -
**Max**, Saturday, November 13, 2010 at 8:16pm
So you would get 22x-10y=-8? how would you combine that with -5x+4y=7?

- Algebra -
**Max**, Saturday, November 13, 2010 at 8:20pm
THanks guys! i get it now!

## Answer this Question

## Related Questions

- Algebra 2 - Solving systems of linear equations in three variables. Ok so i dont...
- algebra - systems of linear equations in 3 variables 1/3x-2/3y+z=0 1/2x-3/4y+z=1...
- algebra - I do not know how to solve the following systems of linear equations ...
- Algebra 2 - Solving Systems of Equations in Three Variables: 3x+3y-z=-3 -2x-3y+...
- Algebra 2 - Solving Systems of Equations in Three Variables: 3x+4y+z=1 x+3y-z=-2...
- algebra 1 - what are some methods of solving systems of linear equations
- Algebra - Solving Linear Equations - Elimination Write whether each of these ...
- algebra - I'm working on solving linear systems by substitution, here are the ...
- math - List advantages and disadvantages comparing and contrasting solving ...
- algebra - Can anyone help me to understand algebra? Right now I am working on ...

More Related Questions