We get the two points (9,2) and (12,3) from the table.
Consider the equation

Substitute x=9 and y=2, we get


Substitute x=12 and y=3 in the equation, we get

Substitute b=2-9m to find the value of m.



Substitute m=1/3 in b=2-9m to find the value of b.


Substitute m=1/3 and b=-1 in the equation, we get

Verification:
consider the third point (33,10).
Substitute x=33 and b=10 in the equation, we get



It is verified.
Hence the required equation is
