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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
Example: Arithmetic: 5 = 5 5 – 2 = 5 – 2
Example: Algebraic: If a = b then a – c = b – c
Example: x + 2 – 2 = 4 – 2 x = 2 x + 2 = 4
Example: Subtract 2 from each side
Example: x = 2
Addition Property of Equality You can add the same value to both sides of an equation
Example: Arithmetic: 9 = = 9 + 2
Example: Algebraic: If a = b then a + c = b + c
Example: x = x = 6 x - 2 = 4
Example: x – =
Example: x = 6
In your own words words write what you learned from this lesson.
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