To solve the equation \( 9x - 6 = -8 \), we can rearrange it into the form of a function.
First, we add 6 to both sides of the equation:
\[ 9x - 6 + 6 = -8 + 6 \]
This simplifies to:
\[ 9x = -2 \]
Next, we can rearrange it further to isolate \( x \):
\[ x = \frac{-2}{9} \]
Now we want to express this equation as a function. The original equation can be rewritten as:
\[ 9x - 6 + 8 = 0 \]
Which simplifies to:
\[ 9x + 2 = 0 \]
Now, from the options given, we look for a function that represents this equation. The correct function is:
\[ f(x) = 9x + 2 \]
Thus, the function that should be graphed in order to solve the equation \( 9x - 6 = -8 \) is:
f(x) = 9x + 2.