Answer
Answers will vary depending on what years you choose.
Work Step by Step
We will consider 2012:
$ y = -4.5(5)+24$
$y = 1.5$
1.5 percent of adults under 30 blog for the given year.
Now, we consider adults over 30:
$ y = 2(5)+7 = 17$
17 percent of people over 30 blogged.