document.write( "Question 162639This question is from textbook saxon algebra2
\n" ); document.write( ": Direct, inverse, or joint variation?
\n" ); document.write( "Please Help. I really don't know the difference.
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\n" ); document.write( " $\"xy=10\"$ \n" ); document.write( "

Algebra.Com's Answer #119864 by Edwin McCravy(20056) $\"\"$ $\"About$

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document.write( "It can't be joint, for there has to be more than two variables\r\n" );
document.write( "to have joint variation.\r\n" );
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document.write( "To tell whether it is direct or inverse:\r\n" );
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document.write( "Substitute any two different values for X and calculate the two \r\n" );
document.write( "different values of Y for each.\r\n" );
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document.write( "If when X INcreases, Y also INcreases, and\r\n" );
document.write( "when X DEcreases, Y also DEcreases then the variation is DIRECT.\r\n" );
document.write( "(they go up or down in the SAME direction),\r\n" );
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document.write( "If when X INcreases, Y DEcreases, and\r\n" );
document.write( "when X DEcreases, Y INcreases then the variation is INVERSE.\r\n" );
document.write( "(they go up and down in OPPOSITE directions),\r\n" );
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document.write( "Substitute Y = 3:\r\n" );
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document.write( "Substitute Y = 6:\r\n" );
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document.write( "So when X INcreased from 3 to 6, Y also INcreased\r\n" );
document.write( "from 1 to 2, so the variation is DIRECT. \r\n" );
document.write( "(They both went UP).\r\n" );
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document.write( "Substitute x = 2:\r\n" );
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document.write( "Substitute x = 5:\r\n" );
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document.write( "So when X INcreased from 2 to 5, Y DEcreased\r\n" );
document.write( "from 5 to 2, so the variation is INVERSE.\r\n" );
document.write( "(One went up and the other went down).\r\n" );
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document.write( "Edwin

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