Question

What is the sun of p and q ?

Answer 1

Since it is linear, we can find a linear equation to represent the relationship.  We have two points (3,6) and (11,15).  The slope is 9/8.  So we have an equation:

y = (9/8)x + b

Plug in (3,6) to find out that b = 21/8
So our equation that represents this linear relationship is:

y = (9/8)x + 21/8

Now to figure out what "p" is, we plug in x = -1, and we get p = 1.5
To figure out what "q" is, we plug in x = 7, and we get q = 10.5

Therefore the sum of p and q:
1.5 + 10.5 = 12