You are Here: Home >< GCSEs

# Maths help Watch

1. How would I do this question?

"Rearrange y = 16 - 4x to make x the subject."
2. (Original post by Jack_Tomlin)
How would I do this question?

"Rearrange y = 16 - 4x to make x the subject."
How would you go about doing it?

Posted from TSR Mobile
3. (Original post by Jack_Tomlin)
How would I do this question?

"Rearrange y = 16 - 4x to make x the subject."
Start by moving everything except 4x on one side, then divide through
4. (Original post by HopelessMedic)
Start by moving everything except 4x on one side, then divide through
Ok so far I've got - 16y = -4x
Is x = -4?
5. You should have taken 16 away from both sides to leave y-16=-4x. The divide through to get x in terms of y
6. (Original post by Jack_Tomlin)
Ok so far I've got - 16y = -4x
Is x = -4?
Remember that you are not solving for an actual value for x, you just want to find what x is in terms of y.
In your answer you correctly subtracted 16 from the RHS, but have not done the same on the LHS. Instead, you've multiplied the LHS by -16.
7. (Original post by surina16)
Remember that you are not solving for an actual value for x, you just want to find what x is in terms of y.
In your answer you correctly subtracted 16 from the RHS, but have not done the same on the LHS. Instead, you've multiplied the LHS by -16.
Ok would you mind answering the question so I can see all the steps?
8. (Original post by Jack_Tomlin)
Ok would you mind answering the question so I can see all the steps?
Sure.

y = 16 - 4x
[-16]
y - 16 = -4x
[*-1]
16 - y = 4x
[/4]
(16-y)/4 = x

you can leave it like that, or you can divide the 16 by the 4 to simplify it:
x = 4 - y/4
or
x = 4 - 0.25y which looks tidier imo
9. (Original post by surina16)
Sure.

y = 16 - 4x
[-16]
y - 16 = -4x
[*-1]
16 - y = 4x
[/4]
(16-y)/4 = x

you can leave it like that, or you can divide the 16 by the 4 to simplify it:
x = 4 - y/4
or
x = 4 - 0.25y which looks tidier imo
Thanks

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: July 6, 2016
Today on TSR

### Falling in love with him

But we haven't even met!

### Top study tips for over the Christmas holidays

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

## 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.

## 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.