Question 179342
First off, find the slope of your first line. 
Re-arrange it into slope intercept form,
{{{y=m[1]*x+b}}}
Then find the slope of the second line, using the slope relationship of perp. lines,
{{{m[1]m[2]=-1}}}
Then use the point slope form, 
{{{y-y[p]=m[2](x-x[p])}}}
{{{y+2=m[2](x-3)}}}
Then re-arrange so that you have no denominators and x and y are on the left hand side, constants on the right hand side. 
Repost if you need more help or get stuck.