Tuesday

September 23, 2014

September 23, 2014

Posted by **sue** on Wednesday, February 25, 2009 at 1:10pm.

5x+2y+z=-25

5x-3y-z=-23

3x+y+2z=-9

- math -
**Anneliese**, Wednesday, February 25, 2009 at 2:25pmUggh... I am doing the same thing right now, and not fully understanding either, but I'll try to explain.

What I was told is to solve the first equation for x or another variable. In this case, it would be easier to do z because it doesn't have a number next to it. Basically, get all of the other junk on the other side so it is "z = blah blah blah."

Then, do the substitution method. If you don't know how to do this, write a response back and I'll explain more in depth. But basically, in the second and third equations, substitute z for whatever you got on the other side of the equal sign (should be -5x - 2y - 25).

That makes there only be x and y in the second and third equations. Then, if you know how, do elimination. If you don't know how to do this, either, I can explain more in depth if you respond back.

After that, solve one of the variables in the equation, and then find the other.

You should have an ordered triple instead of the ordered pair. Instead of the usual answer (x,y) it should be (x,y,z), or three answers, one for each variable.

Hopefully I helped!

- math -
**sue**, Wednesday, February 25, 2009 at 2:33pmnow I'm confused even more

**Answer this Question**

**Related Questions**

Math - Solve the system by addition or substitution. 3x – 4y = 8 6x – 2y = 10 ...

Math- Algebra - hi wat method would i use and how would i solve this system of ...

alegebra - solve the sytem of equation by graphing. Then classify the system as ...

Algebra 1 - What is an equation of a line perpendicular to the line with ...

Algebra - Solve the system of equation by graphing. Then classify the system. 3x...

Math - Please help!!!! Solve each system graphically. Be sure to check your ...

Algebra Multiple Choice - Hello, This is the last of questions I have for my ...

math - solve the system of equation by graphing then classify the system as ...

math - solve the system of equation by graphing then classify the system as ...

Math - Did I do this problem correctly? Solve the following system by first ...