Is the relationship shown by the data linear? if so, model the data with an equation. x= -7, -5, -3 ,-1 , y = 5, 9, 13, 17

First we take the two points (-7,5) and (-5,9).
Compute the slope: 
Then the linear relation may be in the following form 
Since the point (-7,5) is on the line, then 
The relation is then .
We check that the other point are on the above line:

We have then a linear relation.