Geometry Warm up #3
2-5 ALGEBRA PROOFS
Properties of Equality—(Don’t write,
they’re on your PAPER!)
These are the same properties but with
Congruence signs instead of equals.
Distributive Property—Add to Notes!
Problem 1
Problem 2
What is the value of x? Justify each step.
Try with a Partner 
Proofs            
Don’t need to write just READ!
Proof #1
(Copy the T-chart
on your paper!!)
It will give you the 1st step
First reason is
always “given”
STEP
1. 3x = 7 – 1/2x
REASON
1. GIVEN
2. 6x = 14 – x
2. Multiplication Property
3. 7x = 14
3. Addition Property
4. x = 2
4. Division Property
TOO: 3 Steps
Step
1. 2x + 3 = 11
Reason
1. Given
2. 2x = 8
2. Subtraction Property
3. x = 4
3. Division Property
Homework
•2-5 Worksheet
•Have a great weekend!
•Modeling Monday!!!!!