Easy Proofs
Presentation
•
Geography
•
10th - 12th Grade
•
Medium
Haleigh Anderson
Used 12+ times
FREE Resource
6 Slides • 4 Questions
1
Easy Proofs
Ms. Anderson
2
What is a Proof?
A proof is the process you go through to prove something is true...we all like to be right don't we?!
3
Example
GIVEN: 4(2x−7)=8 PROVE: x=7.5
Our first step is to start with what we are given, what we know
4
Multiple Choice
What is our first step in our proof?
x= 7
6x-28=8
4(2x-7)= 8
6x=36
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Next Step
Our next step will be trying to get our prrog closer to what we are trying to prove.
so... 4(2x−7)=8
to get rid of that 4, we have to distribute or multiply it, by the 2x and -7
6
Poll
What do you think the next step will look like now? Go back and look if you need to.
8x=60
8x-28=8
x=7.5
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Almost There!
Now that our equation has been distributed, it should look like this...
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Multiple Choice
What do we need to do next?
Add the 28 to both sides
Subtrate the 28 from both sides
Subtrate the 8
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Finished.... Almost
We have just one last teeny weeny step before our proof is done...
8x=60
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Multiple Choice
What is our answer after we divide?
5.5
7
7.5
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Easy Proofs
Ms. Anderson
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