You are Here: Home >< GCSEs

# Maths: Simulataneous equations

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Solve
2x + 3y = 2/3
3x - 4y = 18
2. make both X's the same by multiplying em

6x + 9y = 2
6x - 8y = 36

minus them from each other
9 - - 8 = 17y
2 - 36 = 34

divide both sides by 17 to get 7
17y = -34
y = -2

then substitute -2 into one of the equations to get x

6x + 9(-2) = 2
6x - 18 = 2
6x = 20
x = 10/3

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: April 17, 2016
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:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

## Study tools

### Essay expert

Learn to write like a pro with our ultimate essay guide.

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.