When we substitute a number for a letter, we simply replace the letter with the number.
Example
Work out the value of the following expression when a = 4 and b = 9
a | + | b |
2 | 3 |
Answer
We substitute a = 4 and b = 9 into the following expression:
a | + | b |
2 | 3 |
= | 4 | + | 9 |
2 | 3 |
= 2 + 3 = 5
Let's try some questions now.