Answer:
third option
Step-by-step explanation:
first write the equation of the graph wich is
first we will find
which is the slope, to find it use this formula:

take any 2 points from the graph, we will take the point
and 
now we should substitute :

we found the slope which is 
now we are oing tooo put it in tthe equation:

Now we are going to take
and substitute in the equation:

now we will find
:

since
is equal to
no need to write it in the equation, so we will write it as:
