Question 1048985
z varies jointly as x and y
<pre>
{{{z}}}{{{""=""}}}{{{k*x*y}}}

x is 4 when y=3 and z=2.

Substitute x=4, y=3, z=2

{{{2}}}{{{""=""}}}{{{k*4*3}}}

{{{2}}}{{{""=""}}}{{{12k}}}

Divide both sides by 12

{{{2/12}}}{{{""=""}}}{{{k}}}

{{{1/6}}}{{{""=""}}}{{{k}}}

Substitute {{{1/6}}} for k in

{{{z}}}{{{""=""}}}{{{k*x*y}}}

{{{z}}}{{{""=""}}}{{{expr(1/6)*x*y}}}
</pre>
What is z if x=8 and y=6
<pre>
Substitute x=8 and y=6

{{{z}}}{{{""=""}}}{{{expr(1/6)*8*6}}}

{{{z}}}{{{""=""}}}{{{8}}}

Edwin</pre></b>