What is algebra?
Algebra is like solving a puzzle. Here’s an example of a puzzle we can solve.
In algebra, we don't use empty boxes like this. Instead, we use letters. Usually, we use the letters x and y. Letters take up less space than empty boxes!
So this puzzle would become:
The letter x represents the empty box, it's the missing number.
Question
x + 2 = 9
x = ?
Solution
? + 2 = 9
7 + 2 = 9
The missing number is 7.
Answer: x = 7