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# Addition and Subtraction Equations - PowerPoint PPT Presentation

Addition and Subtraction Equations. Created by Christine Berg Edited by V Hamilton. Inverse Operations:. Addition is the opposite of subtraction and vice versa. Models. = Variable. = 1. = -1. Subtraction Property of Equality. You can subtract the same value from both sides of an equation.

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Presentation Transcript

Created by Christine Berg

Edited by V Hamilton

Inverse Operations:

Addition is the opposite of subtraction and vice versa

Models

= Variable

= 1

= -1

Subtraction Property of Equality

You can subtract the same value from both sides of an equation

Example:

Arithmetic:

5 = 5

5 – 2 = 5 – 2

Example:

Algebraic:

If a = b

then a – c = b – c

Example:

x + 2 = 4

x + 2 – 2 = 4 – 2

x = 2

Example:

x + 2 = 4

Example:

Subtract 2 from

each side

You can add the same value to both sides of an equation

Example:

Arithmetic:

9 = 9

9 + 2 = 9 + 2

Example:

Algebraic:

If a = b

then a + c = b + c

Example:

x - 2 = 4

x - 2 + 2 = 4 + 2

x = 6

Example:

x - 2 = 4

Example:

+

+

x – 2 + 2 = 4 + 2