You are Here: Home >< Maths

# HELP - how do you solve three simultaneous equations using matrices?? Watch

1. 3x +2y + z = 5
x + 4y - 2z = 3
2x + y + z = 3

how do you solve these three simultaneous equations using a 3x3 matrix?

Any help on this is much appreciated! thanks
2. Use Cramer's rule.
3. (Original post by Dekota-XS)
Use Cramer's rule.
This.
4. Cramer's rule is very easy to get wrong. Just use Gaussian elimination.
5. Augmented matrix:

Then use Gaussian elimination.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 13, 2010
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Cambridge interviews pour in...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.