document.write( "Question 308977: Suppose that y varies jointly with w and x and inversely with z and y=360 when w=8, x=25, and z=5. Write the equation that models the relationship. Then find y when w=4 and z=3. \n" ); document.write( "

Algebra.Com's Answer #221012 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Suppose that y varies jointly with w and x and inversely with z
\n" ); document.write( "Let k = the variation constant
\n" ); document.write( "y = $\"%28k%2Aw%2Ax%29%2Fz\"$
\n" ); document.write( ":
\n" ); document.write( "and y=360 when w=8, x=25, and z=5. Write the equation that models the relationship.
\n" ); document.write( " $\"%28k%2A8%2A25%29%2F5\"$ = 360
\n" ); document.write( ":
\n" ); document.write( " $\"%28200k%29%2F5\"$ = 360
\n" ); document.write( ":
\n" ); document.write( "40x = 360
\n" ); document.write( "k = $\"360%2F40\"$
\n" ); document.write( "k = 9 is the constant
\n" ); document.write( "and
\n" ); document.write( "y = $\"%289wx%29%2Fz\"$ is the equation
\n" ); document.write( ":
\n" ); document.write( "Then find y when w=4 and z=3. We have to know x, when you know that, use the above equation to find y \n" ); document.write( "

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