Answer:
x = 27
y = 29
Step-by-step explanation:
If you want to solve it the answer is 13...
If you want multiple ways to write that here are some:
3x4+2-1
3x4+1
12+2-1
12+1
Etcetera
The difference quotient for the function f(x) is 
Given :
Difference quotient formula

Given function 
find the difference quotient using the formula
first we find out f(x+h) using given f(x)
replace x with x+h

Now replace it in our formula and also replace f(x)

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