When a player is substituted in a football game, that player is taken off, and another player put on instead.

It's the same in maths, except we have numbers and letters instead of players!

Take a formula like this:

F = ma

Imagine we substitute m=3 and a=5 into the formula; it’s like taking two players off the pitch who had m and a written on their shirts, with players numbered 3 and 5.

We have to remember though that ma actually means “m times a” – we CANNOT just write F = 35, this is WRONG!

We need to substitute the numbers like this:

F = 3 x 5

Then you can work out your maths solution:

F = 15

Lets try one more example. If y = ft / s and f is substituted by 4 and t is substituted by 5 and s is substituted by 2 what is our answer?

Answer:

y = 4 x 5 / 2 = 10

Nothing in this section yet. Why not help us get started?

## Follow the links below to see how this topic has appeared in past exam papers

AQA Unit 2 November 2011 (F) - Page 11, Question 15(a)

## Related Topics

After this move on to…

## Related Questions

• 1
Vote
3
Answers

### What is the general form for a quadratic equation?

By Filsan on the 10th of January, 2013

• 1
Vote
2
Answers

### What does the graph of Y = x Linear look like?

By Filsan on the 10th of January, 2013

• 1
Vote
3
Answers

### What is the equation of a straight line graph?

By Filsan on the 10th of January, 2013

• 0
Votes
4
Answers

### How do I find 15% of a value?

By Verity Painter on the 8th of January, 2013

• 0
Votes
1
Answer

### what is a data collection sheet?

By Lee Mansfield on the 11th of June, 2012

• 0
Votes
2
Answers

### what is a pie chart?

By David Moody on the 11th of June, 2012

• 0
Votes
1
Answer

### how do you reflect using a line?

By Lisa Kelly on the 11th of June, 2012

• 0
Votes
0
Answers

### What is the formula for working out the circumference of a circle?

By Lee Mansfield on the 11th of June, 2012

• 1
Vote
3
Answers

### What is the formula used to work out the area of a circle?

By Lee Mansfield on the 11th of June, 2012