To find cost per each you divide $18 by 8 and get $2.25 per book.
To find how much for $27 you divide by $2.25 and get 12 books
Answer:
The answer to your question is: y = 8x
Step-by-step explanation:
As both lines are parallels, then the slope is the same.
From the line given, get the slope
m = 8
Point (0, 0)
(y - y1) = m(x - x1)
(y - 0) = 8(x - 0)
y = 8x
Step-by-step explanation:

I'm pretty sure your answer would be true