Substitution and Writing Expressions

Front

What are variables in an expression?

Back

Variables are symbols (like x and y) that represent unknown values in mathematical expressions.

Front

Evaluate the expression a - 2b when a = -9 and b = 4.

Back

22

Front

How do you express 'five times Mike's age increased by 9' mathematically?

Back

5x + 9

Front

What is the product of 4 and p expressed in mathematical terms?

Back

4 × p

Front

How do you write '10 less than a number n' as an expression?

Back

n - 10

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, ×, ÷) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation states that two expressions are equal.

Front

What is the term for the number in front of a variable in an expression?

Back

Coefficient.

Front

If x = 3, what is the value of 2x + 5?

Back

11