Expressions and Equations

Front

What is an equation?

Back

An equation is a mathematical statement that asserts the equality of two expressions, typically containing variables and constants.

Front

What does the variable represent in an equation?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an equation.

Front

Write an equation to model the situation: Cheryl gets paid $8 per hour and made a total of $96 last week.

Back

Front

What is a constant in mathematics?

Back

A constant is a fixed value that does not change, such as the number 5 or -3.

Front

How do you solve the equation: 5r + 2 = 27?

Back

Subtract 2 from both sides to get 5r = 25, then divide by 5 to find r = 5.

Front

What is a coefficient?

Back

A coefficient is a numerical factor in a term of an algebraic expression, such as the 8 in 8h.

Front

Write an expression for the sum of b baseballs hit yesterday and 135 baseballs hit today.

Back

Front

What is the purpose of using variables in expressions?

Back

Variables allow us to represent unknown quantities and formulate general mathematical statements.

Front

Which equation represents the situation: A t-shirt (t) plus $12 is $42?

Back

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal.