### Math:

Equations

### Letters in Math?

In algebra, we do math with letters, known as “variables.” Variables take the place of numbersâ€”so you can substitute a number for a variable to find an answer. This lets us use the same equation or expression for different situations or problems. An expression is a statement that uses variables. It does not use an equal sign. For example, **2x+5** is an expression. An equation is a statement using variables that does use an equal sign. For example, **2x+5=17** is an equation. Use this VLE to explore both expressions and equations!

### Videos about Algebraic Equations and Expressions:

Writing Algebraic Expressions for Situations