For a given input value q, the function f outputs a value r to satisfy the following equation.

To solve this, you re-arrange the equation to get r by itself:

3r - 6 = 11q - 4
3r = 11q + 2           (add 6 to both sides to cancel out the -6)

r =       (divide both sides by 3 to get what r is)

This can also be written as: r =
-------------------------------------------------------------------------------------------------------------

ANSWER:

f(q) = 

OR

 f(q) = 

OR

f(q) = (11q + 2) / 3                              (if you can't put in fractions)

The answer is: a = about 63.59ft2 for 15