Properties Of Equality
When you add something to one side, you must add it to the other side too.
What is the Addition Property of Equality?
Add 3 to both sides to get x=3
What is x-3=0?
WRITE AND SOLVE AN EQUATION. Lisa sold her shoes to Tom. She started with $12 but now she has $42. How much did Tom give her?
12+x=42
x=$30
When you subtract something to one side, you must subtract it to the other side too.
What is the Subtraction Property of Equality?
When you multiple something to one side, you must multiply it to the other side too.
What is the Multiplication Property of Equality?
When you divide something to one side, you must divide it to the other side too.
What is the Division Property of Equality?
We do this in order to keep an equation balanced.