SOLUTION: Can you give me some proves why does the product of two negative numbers is positive?

Question 201691: Can you give me some proves why does the product of two negative numbers is positive?
Answer by RAY100(1637) (Show Source): You can put this solution on YOUR website!
Refer to the website, "mathisfun' for a nice picture
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To be brief, think of a negative number as a debt. If you double the debt(multiply by +2) it makes sense that it is twice as negative.
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However if you multiply a debt by (-2) , it also makes sense that you now have positive double the value of debt.
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This is very similar to a double negative in English. Do "not be not good"(bad), is a positive "be good".
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Hopefully this might help. Keep up good work
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