Answer is (c.) the point where the two subscription costs the same
Step-by-step explanation
Y=96 is the horizontal flat fee line.
Y=3x is the slope line of $3 per book
The point where they intersect is where the two costs are the same - at 32 books
We can prove this when the equations equal each other
Y = 96
Y = 3x
Substitute the value of y = 3x into the first equation
3x = 96
Divide both sides by 3 to solve
3/3x = 96/3
x = 32
This is the point where the costs equal