Both Proof


Both Proof
Mathematical proof as to why doing the same operation on both sides of an equation keeps it true?

Could someone post a link to a proof as to why doing the same operation on both sides of an equation keeps it true (or type it up here)? I couldn't find one searching on google... Thanks.

start with 1=1, then any changes you make to one side Must Have an exact same change on the otherside

The proof is in the pudding.

Scroll Down To Find Both Proof On eBay Below:

Z 156 MALDIVES 1979 100 RUFIYAA AND 1979 10 RUFIYAA BOTH IMPAIRED PROOF
Z 156 MALDIVES 1979 100 RUFIYAA AND 1979 10 RUFIYAA BOTH IMPAIRED PROOF
US $65.00
 2 PROOF COINS from NEW ZEALAND 5 10 CENTS BOTH DATING 1978
2 PROOF COINS from NEW ZEALAND 5 10 CENTS BOTH DATING 1978
US $3.50
 2 PROOF COINS from NEW ZEALAND 5 10 CENTS BOTH DATING 1980
2 PROOF COINS from NEW ZEALAND 5 10 CENTS BOTH DATING 1980
US $3.50
 2 PROOF COINS from BARBADOS 5 10 CENTS BOTH DATING 1973
2 PROOF COINS from BARBADOS 5 10 CENTS BOTH DATING 1973
US $1.75
2 NICE PROOF COINS from the BAHAMAS 1 5 CENTS BOTH DATING 1980
2 NICE PROOF COINS from the BAHAMAS 1 5 CENTS BOTH DATING 1980
US $2.50
 2 NICE PROOF COINS from the BAHAMAS 1 5 CENTS BOTH DATING 1976
2 NICE PROOF COINS from the BAHAMAS 1 5 CENTS BOTH DATING 1976
US $1.75
 2 NICE PROOF COINS from the BAHAMAS 1 25 CENTS BOTH DATING 1974
2 NICE PROOF COINS from the BAHAMAS 1 25 CENTS BOTH DATING 1974
US $1.75
 2 PROOF COINSBARBADOS1 5 CENTSBOTH DATING 1973
2 PROOF COINSBARBADOS1 5 CENTSBOTH DATING 1973
US $1.50
2 NICE PROOF COINS from PAKISTAN 5 10 PAISA BOTH DATING 1961
2 NICE PROOF COINS from PAKISTAN 5 10 PAISA BOTH DATING 1961
US $2.50
September 2nd, 2010 in World Coins

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