#### Topic Content:

- Substitution into an Algebraic Expression

Substitution into an algebraic expression is the process of replacing a letter with a number, in a given algebraic expression. The letters are called variables because they can be replaced by any value.

### Example 2.4.1:

IfÂ x =Â 2Â and yÂ =Â 3Â Â Â Â *Find the following:***i.** \( \scriptsize x \: + \: 6 \)**ii.** \( \scriptsize 4 \: + \: x \: + \: y \)**iii.** \( \scriptsize y \: – \: x \)**iv.** \( \scriptsize 10 \: – \: 2y \: – \: 3 \)

**Solution**

**i.** \( \scriptsize x + 6 \\ = \scriptsize 2 + 6 \\ = \scriptsize 8 \)

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