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)

The graph in the attached figure

Step-by-step explanation:

Let

x------->  the number of books ordered

y------> the cost in dollars

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

In this problem we have a proportional variation

so

Step 1

Find the value of k

For

------> substitute the values

For

------> substitute the values

For

------> substitute the values

The equation of the linear equation is equal to

Step 2

For -------> Find the value of y

substitute the value of x in the linear equation

The point is

Step 3

For -------> Find the value of y

substitute the value of x in the linear equation

The point is

Step 4

For -------> Find the value of y

substitute the value of x in the linear equation

The point is

Step 5

Using a graphing tool

Plot the three equivalent ratios on a coordinate grid

see the attached figure

where are the choices?