Answer:

Step-by-step explanation:
Assuming we want to find the equation (74,2) and (4,9)
This is an equation of a straight.
Let this equation be y=mx+b.

We substitute the slope and (4,9) to get:

We rewrite in standard form to get:

The correct answer is letter B, (6,-1).
When you substitute this ordered pair on the equations, you would found out is the correct one.
7 2/3 + 8 5/6 = 16 1/2 ( or 32/2 )