When you are given a point (p,q) and a slope=m, you can construct the line with slope m through point (x,y) with the following:

y-q=m(x-p)

So you got m=2 and (p,q)=(-3,-5) so just plug it in

Then you have to change it to y=mx+b, so once you plug your stuff in, multiply through on the right and add q to both sides

y=mx-mp+q

Can you make the correct substitutions?