Question 1065683
x varies inversely as y^2,<pre>
{{{matrix(1,3,x,""="",k/y^2)}}}</pre>and x = 4 when y = 10.<pre> {{{matrix(1,3,4,""="",k/10^2)}}}

{{{matrix(1,3,4,""="",k/100)}}}

{{{matrix(1,3,400,""="",k)}}}

Substitute 400 for k in

{{{matrix(1,3,x,""="",k/y^2)}}}

{{{matrix(1,3,x,""="",400/y^2)}}}

That's the equation for x in terms of y.</pre>Find x when y = 2.<pre>Substitute 2 for y

{{{matrix(1,3,x,""="",400/2^2)}}}

{{{matrix(1,3,x,""="",400/4)}}}

{{{matrix(1,3,x,""="",100)}}}

Edwin</pre>