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Write an indirect proof for the following given 4y divided by6y 6 equals 20 prove y not equal to -1?
Wiki User
∙ 14y ago
Assuming the given is written as:
4y/6y6=20
First off, this can be simplified down to:
2/3y5=20
Since this is an indirect proof, we must first assume the opposite of what you are trying to prove. You are trying to prove that y is not equal to -1.
Let y=-1
If this was done, then the following substitution would be made:
2/3(-1)5=20
2/3(-1)=20
2/(-3)=20
-2/3 =20
Clearly, -2/3 does not equal 20. Since y=-1 causes a mathematically impossible statement, then y cannot equal -1.
As far as formatting it for a formal indirect proof, I'm no help there. Different teachers like different formatting.
Wiki User
∙ 14y ago
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