document.write( "Question 1091802: If x and y vary directly, and x=10 when y=3, what will be the value of x when y=9?? \n" ); document.write( "

Algebra.Com's Answer #706257 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "If $\"x\"$ and $\"y\"$ vary $\"directly\"$ , we have\r
\n" ); document.write( "\n" ); document.write( " $\"y=kx\"$ \r
\n" ); document.write( "\n" ); document.write( "and if $\"x=10\"$ when $\"y=3\"$ ,we can use it to find $\"k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"3=k%2A10\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"k=3%2F10\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"k=0.3\"$ \r
\n" ); document.write( "\n" ); document.write( "so, equation is: $\"y=0.3x\"$ \r
\n" ); document.write( "\n" ); document.write( "the the value of $\"x\"$ when $\"y=9\"$ is:\r
\n" ); document.write( "\n" ); document.write( " $\"9=0.3x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"9%2F0.3=x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=30\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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