Which line is a linear model for the data?

D.

Step-by-step explanation:

It would be best to first make sure the line follows the direction of the dots; immediately eliminating B & C.

Then you want to make sure that the estimated line is in the middle and near all of the dots in some way; leaving the final answer, D.

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a