Is this how I do it? s=P-4? Or is that completely wrong? I'm all new to literal equations and formulas.

Here's some harder ones:

C=5/9(F-32) Solve for F

A=1/2(b^1+b^2)h Solve for h

And one other, and I'm done...for now. :? Don't worry, though, I'll be back. But...in solving for y, which is pretty easy, how do I do it in a problem that involves fractions, such as:

3/4x - 2/5y = 1/2

I don't see how I could multiply by a common denominator, as in equations with a single variable. Do I multiply by reciprocals? I need an explanation on that, too.

Thanks, again! I appreciate all your help!