You are Here: Home >< GCSEs

# Simultaneous Equations watch

1. I have worked out

6x - 2y = 33
4x + 3y = 9

to be x = 4.5 and y = -3

What I want to know is say if the first two numbers in each equation had different signs say 6x is -6 instead and then the 4x remains positive. How would I do this then?

Would I need to add the two equations together still?
2. (Original post by JackT2000)
I have worked out

6x - 2y = 33
4x + 3y = 9

to be x = 4.5 and y = -3

What I want to know is say if the first two numbers in each equation had different signs say 6x is -6 instead and then the 4x remains positive. How would I do this then?

Would I need to add the two equations together still?
Almost nothing changes when you are dealing with a negative number.

It is not clear exactly how you did it this time but for example you could multiply the second equation by 1.5 (6/4) and add them together, or multiply by -1.5 then take the first away from the second (both of which are identical anyway)
3. (Original post by JackT2000)
I have worked out

6x - 2y = 33
4x + 3y = 9

to be x = 4.5 and y = -3

What I want to know is say if the first two numbers in each equation had different signs say 6x is -6 instead and then the 4x remains positive. How would I do this then?

Would I need to add the two equations together still?
Yes, everything must still be done the same. The only difference is, you multiply the 2nd equation by -6 as opposed to 6. You still have to add the equations.

Posted from TSR Mobile

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: February 3, 2017
Today on TSR

### A-Level OCR Biology Unofficial Markscheme

Find out how you've done here

### 3,513

students online now

Exam discussions

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.