6y6-5y3-4
Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "divided by", "equals", "squared", "cubed" etc.
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.
6y6
6y6-5y3-4
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "equals".
Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "divided by", "equals", "squared", "cubed" etc.
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.