<p>pg 794 #12
if y is directly proportional to x^2 and y=1/8 when x=1/2 what is the positive value when y=9/2.
thanks for helping out</p>
<p>y=k<em>x^2
1/8=k</em>(1/2)^2
1/8=k*1/4
1/8=1/4k
(1/8)(4)=k
1/2=k</p>
<p>so
y=1/2<em>x^2
9/2=1/2</em>x^2
2*9/2=x^2
9=x^2
x=3 or x=-3
since they want the positive answer, its x=3.</p>
<p>If my explanation is confusing, feel free to ask for a clarification.</p>
<p>thanks, it was a perfect explanation.</p>