f(3) = 2 from the graph.
f(a) - f(3) = -3
f(a) - 2 = - 3
f(a) = - 3 + 2
f(a) = - 1
That means that the y value is -1
When the y value is -1 from the graph then the x value associated with it is 1.
The answer is C
