We have looked at the command words in algebra in a different activity.

Let's use these along with algebraic language in this activity.

**Recap**

8n is a **term **

8n + 4 is an **expression **

8n + 4 = 20 is an **equation**

Let's try a question!

__Example__

Gracie is x years old.

Her brother Max is 3 years older.

Write an** expression** for their total ages.

**Answer**

We know Gracie's age is x.

If Max is 3 years older we can write his age as x + 3 (that means Gracie's age + 3 yrs).

Their total ages are:

x + x + 3 which we can **simplify** by collecting like terms:

= **2x + 3 ** (this is an **expression**).

**Part 2**

If we knew that the combined ages of Gracie and Max is 25 years, we could make an **equation** with the **expression** we have:

**2x + 3 = 25 **

We could then **solve** this to find Gracie's age (x).

2x = 22

x = 11

Therefore, Gracie is 11 years old and Max is 3 years older, so he is 11 + 3 = 14 years old.

Let's try some of these!