Answer:9
Step-by-step explanation:
The way you worded the question kind of confuses me but i'll try to answer.
Think of recursion like climbing a ladder; in this type of sequence you start out somewhere, usually n. So in f(n-1)+1, you take n (where you started) and "step down" once, and then step up once (which brings you back where you were). Remember PEMDAS when doing these.
x = a - is a vertical line, where a is any real number
x = -5 - the vertical line passes through any points in the form (-5, y). Where y is any real number.
Look at the picture.