Writing Algebraic Equations: Addition and Subtraction

This video tutorial teaches how to write algebraic equations from real-world scenarios by determining when to use addition or subtraction. It explains the concept of variables and provides two examples: one involving subtraction with Jennifer and Deidra's spending, and another involving addition with Steve's purchase. The lesson concludes with a summary of the key points covered.

What is a variable in the context of algebraic equations?

• A letter or symbol representing an unknown number

• A fixed number used in calculations

• A mathematical operation

• A type of equation

In the scenario with Jennifer and Deidra, what operation is used to find out how much Jennifer spent?

• Addition

• Multiplication

• Division

• Subtraction

If Deidra spent $18.30, which is $7 less than Jennifer, what equation represents this situation?

• x + 7 = 18.30

• x = 18.30 - 7

• x = 18.30 + 7

• x - 7 = 18.30

In Steve's example, what operation is used to find the cost of the magazine?

• Subtraction

• Addition

• Multiplication

• Division

What is the simplified equation to find the cost of the magazine in Steve's scenario?

• m - 1.50 = 10

• m + 1.50 = 10

• m - 6.75 = 10

• m + 6.75 = 10