# Equations and identities

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## Lesson details

### Key learning points

- In this lesson, we will look at the difference between an equation and an identity.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

Which of the following are expressions?

10 = 2e

3a + 2 = 5

Q2.

What is the value of the cubes if a = 4?

12

16

8

Q3.

What is the value of this expression if a = 5?

-3

29

5

Q4.

Which expression has the greatest value when a = 7?

2a + 1

3a - 6

Q5.

Which expression has the greatest value when a = 4?

3a - 6

Neither - they are both equal

### 8 Questions

Q1.

If a = 3, which of the following is true?

4a + 1 = 12

6a = 3 - a

Q2.

Which description best fits an identity?

A collection of variables

Something that can always be solved to find a value

Q3.

Is the following an expression, equation, or identity?

Expression

Identity

Q4.

Is the following an expression, equation, or identity?

Equation

Expression

Q5.

If x=5, which symbol should go in the box?

≠

≡

Q6.

If x=5, which symbol should go in the box

=

≡

Q7.

If x=5, which symbol should go in the box

≠

≡

Q8.

If x=5, which symbol should go in the box

=

≠