document.write( "Question 1080750: If x varies directly as y, and x = 20 when y = 5, find x when y = 9 \n" ); document.write( "
Algebra.Com's Answer #694883 by MathLover1(20850)\"\" \"About 
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\r
\n" ); document.write( "\n" ); document.write( "if \"y\" varies \"directly\" as \"x\", we have\r
\n" ); document.write( "\n" ); document.write( "\"y=kx\" \r
\n" ); document.write( "\n" ); document.write( "If \"x+=+20\" when \"y+=+5\",we can find \"k\":\r
\n" ); document.write( "\n" ); document.write( "\"5=20k\"\r
\n" ); document.write( "\n" ); document.write( "\"5%2F20=k\"\r
\n" ); document.write( "\n" ); document.write( "\"k=1%2F4\"\r
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\n" ); document.write( "\n" ); document.write( "so, \"x\" when \"y=+9+\" will be:\r
\n" ); document.write( "\n" ); document.write( "\"9=%281%2F4%29x\" \r
\n" ); document.write( "\n" ); document.write( "\"x=9%2A4\"\r
\n" ); document.write( "\n" ); document.write( "\"x=36\"
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