Question 149545
{{{3r=sin(A)}}}
Remember that 
{{{r^2=x^2+y^2}}}
{{{x=r*cos(A)}}}
{{{y=r*sin(A)}}}
Let's start,
{{{3r=sin(A)}}}
{{{3r^2=r*sin(A)}}}Multiply both sides by r.

{{{3(x^2+y^2)=y}}}Substitute.
{{{3(x^2+y^2)-y=0}}}Collect terms on one side.