The table shows the ratio between the number of books ordered and their cost: number of books cost (dollars) 7, 28 8,32 9,36 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. (20 points).

The information that is given:
x:  7     8     9 
y:  28   32   36

shows us that to find the second value (y), you would multiply the x value by 4.

If the numbers are 1, 2, and 3 the new information would look like this:

x:  1    2    3
y:  4    8    12 

The ordered pairs with this information would be:

(1,4), (2,8), and (3,12)

To plot these points, you will begin at the origin (0,0) or the point where the 2 axes/number lines cross).  From here you will move to the right (as far as the 1st number says) on the horizontal number line.  Then you will move up the number of places the 2nd number says.

Always return to the origin before plotting the next ordered pair. 

 

D) the x-intercept represents adam's commission pay when he had zero total sales