solving variables

Question

S+4t= r for s

Answer 1

I assume upper case "S" and lower case "s" are the same variable.

 

s + 4t = r

 

s = r - 4t

 

There is not much more we can do beyond this point.

Answer 2

s + 4t = 5

s = 5 - 4t    subtract 4t from both sides