What is the function rule for the graph shown?

A graph of the ordered pairs: nine comma zero, eleven comma two, twelve comma three, and fourteen comma five.

y = x + 9

y = x – 9

y = 9x

y equals one over nine x

Question

What is the function rule for the graph shown?

A graph of the ordered pairs: nine comma zero, eleven comma two, twelve comma three, and fourteen comma five.

 y = x + 9

 y = x – 9

 y = 9x

 y equals one over nine x

anonymous · Answer

Let's use 2 points to get our gradient:

(9,0) and (11,2)

m = (y2-y1)/(x2-x1)
m = (2-0)/(11-9)
m = 2/2
m = 1

So we know it is one of the first two. Do you think you can take it from here?