Question

The table shows the ratio between the number of books ordered and their cost:

Number of Books

Cost (dollars)

7 21

8 24

9 27



Find equivalent ratios when the number of books ordered is 1, 2, and 3. Write them as ordered pairs in the form (x-coordinate, y-coordinate). Starting from the origin, explain how to plot the three equivalent ratios on a coordinate grid. (10 points)

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Answer 1

Answer:

7 books cost $21 and so on. So we have the points,

7,21

8,24

9,27

on a line.

It can be seen that the eq formed is y=3x( y is cost and x is number of books).

When x is 1, ratio= 1:3 1,3

When x is 2, ratio= 2:6 2,6

Wgen x is 3, ratio= 3:9 3,9

Since they are equivalent, they lie on the same line y=3x.

Answer 2

Answer:

If 7 books cost $21 and son we plot the points on a coordinate grid like this: (7,21), (8,24), (9,27), for 1, 2, and 3, we put it like this: (1,3), (2,6), (3,9), we put it like this because 7x3 equals the number on the graph and so does 8 and 9, so we already know we have to multiply it by three with each number we get. We would plot them as they show, 1 space up, 3 spaces o the right, with 2 you go 2 spaces up,6 spaces to the right, now 3 you go 3 spaces up and 9 spaces to the right, and so on.

Step-by-step explanation:

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