document.write( "Question 970342: z=8 when x=2 and y=4, z varies jointly with x and y, what does the function look like? \n" ); document.write( "
Algebra.Com's Answer #592992 by rothauserc(4718)\"\" \"About 
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z = k*x*y where k is the constant of proportionality
\n" ); document.write( "8 = k*2*4
\n" ); document.write( "k = 1
\n" ); document.write( "therefore the equation looks like
\n" ); document.write( "z = x * y
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