document.write( "Question 176364: Could you give me an example of why the inequality sign changes when both sides are multiplied or divided by a negative number? I just don't understand and hope you can give me some examples. \n" ); document.write( "
Algebra.Com's Answer #131461 by Fombitz(32388)\"\" \"About 
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1.\"x%3E1\"
\n" ); document.write( "All points to the right of x=1 satisfy that equation.
\n" ); document.write( "Now multiply the equation by (-1) and don't change the sign.
\n" ); document.write( "2.\"-x%3E-1\"
\n" ); document.write( "Now pick a point in the region that satisfies the original equation.
\n" ); document.write( "Let's pick x=3 and plug it into eq. 2,
\n" ); document.write( "2.\"-x%3E-1\"
\n" ); document.write( "\"-3%3E-1\"
\n" ); document.write( "Clearly -3 is not greater than -1.
\n" ); document.write( "So you cannot satisfy both eq. 1 and eq. 2 because you have not changed the sign of the inequality.
\n" ); document.write( "Not changing the sign leads to incorrect results, hence the reason the inequality sign needs to be changed. \r
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