x varies inversely with y.
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document.write( "That says
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document.write( "When x is 40, y is 50.
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document.write( "With that information we can determine k:\r\n" );
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document.write( "Multiply both sides by 50\r\n" );
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document.write( "Now we must substitute that value \r\n" );
document.write( "of k into
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document.write( "Now we have the complete equation.\r\n" );
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document.write( "Now with that complete equation we can answer\r\n" );
document.write( "the other part:\r\n" );
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document.write( "What is y when x is 25?
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document.write( "Substitute 25 for x\r\n" );
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document.write( "Multiply both sides by y\r\n" );
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document.write( "Edwin
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