Objectives

• Solve single-variable addition equations. 
• Solve single-variable subtraction equations. 
• Recognize and apply the addition and subtraction properties of equality and the inverse relationship of addition and subtraction. 
• Model and solve real-world problems using addition and subtraction equations. 

Vocabulary

Isolate the variable 

an explanation used to describe the action of getting the variable alone on one side of the equal sign. 

Inverse Operation 

the opposite operation 

Subtraction Property of Equality 

states that you can subtract the same quantity from both sides of an equation and have the equation still balance. 

Addition Property of Equality 

states that you can add the same quantity to both sides of an equation and have the equation still balance.