Answer: Option C

Step-by-step explanation:
To solve this problem use the properties of the logarithms.
We know that the inverse function of
is
.
So when composing the function with its inverse function we have to:
.
Now apply this property on both sides of the equation

the answer is the option C
Px + qy = r
2px - qy = 2r
----------------add
3px = 3r
x = 3r/3p
x = r/p