First of all, lets get y on its own side of the equation.

This is slope intercept form, y=mx+b, where m is slope.
we can see that m=2, so the slope is 2 or 
Answer:
9
Step-by-step explanation:
121 x 12 = 1452 so over 1500 is not a correct estimate. Less than 1500 is the right estimate
Looks like all real numbers except 1. It touch's all the y except 1 aka range