document.write( "Question 949903: suppose y varies direct with x. write a direct variation equation that relates x and y if x = 4 and y =-2 \n" ); document.write( "

Algebra.Com's Answer #579999 by MathLover1(20849) $\"\"$ $\"About$

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\n" ); document.write( "if $\"y\"$ varies direct with $\"x\"$ , then $\"y=kx\"$ \r
\n" ); document.write( "\n" ); document.write( "write a direct variation equation that relates $\"x\"$ and $\"y\"$ if $\"x+=+4\"$ and $\"y+=-2\"$ :\r
\n" ); document.write( "\n" ); document.write( "we need to find constant $\"k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=kx\"$ .....plug in $\"x+=+4\"$ and $\"y+=-2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-2=k%2A4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-2%2F4=k\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"k=-1%2F2\"$ \r
\n" ); document.write( "\n" ); document.write( "so, direct variation equation will be: $\"y=-%281%2F2%29x\"$ \r
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