Writing Expressions and Equations

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

An equation is a mathematical statement that asserts the equality of two expressions, typically containing an equal sign (=).

The expression is $$p + 15$$ .

It means to divide the number x by 3, represented as $$\frac{x}{3}$$ .

The expression is $$\frac{x}{3} + 4$$ .

The equation is $$8h = 96$$ , where h is the number of hours worked.

The expression is $$n(n + 2)$$ .

A variable is a symbol, often a letter, that represents an unknown value in an expression or equation.

It means to convert a verbal statement into a mathematical expression using variables and numbers.

An expression does not have an equal sign and represents a value, while an equation states that two expressions are equal.