Step-by-step explanation:
n! = n × n−2 × n−3 × ... × 2 × 1
(n+1)! = n+1 × n × n−2 × n−3 × ... × 2 × 1
(n+1)! = (n+1) n!
Therefore:
lim(n→∞) (n! / (n+1)!)
lim(n→∞) (n! / ((n+1) n!))
lim(n→∞) (1 / (n+1))
0
So you have the slope. After this you simply use the slope formula y=mx+b.
Then you simply plug in.
The answer is 4 because the point x is equal to 4 on the graph