Let me suggest you google Algebra I Word Problems.

Basically you're going to get a couple different kinds of problems. Most of them will reduce to line equations, y=mx+b, where y is the height, x the width, m the slope, and b the height at 0. Remember that, if you are given two points (x1,y1) and (x2,y2), you can figure out the slope with m=(y1-y2)/(x1-x2). Then you can take that and plug it into b=y-mx. Now you'll have a line equaion you can use to find any point on the line.

Sometimes you're going to have two intersecting line equations, like with the balloon problem.

The trick is to look the word problem over and try and pick out the lines you need to write equations for.

My problem is that I have gone through Differential Equations (which I failed), and most of the problems that come to my mind require at least trig if not calculus to solve. Sorry about that.

Google is your friend here. Good luck and Godspeed.