Question

The scatter plot below shows the number of prom tickets sold over a period of 7 days. The line of best fit drawn on the plot shown is used to predict the number of tickets sold on a certain day. Use the two points shown on the line of best fit to calculate its slope to the nearest tenth.

Answer 1

The slope is
`4.2\ (tickets)/(day)`

Explanation:

The picture of the question in the attached figure

Let

x ----> the number of days

y ---> the number of tickets sold

we have the points

(1,30) and (7,55)

The formula to calculate the slope between two points is equal to

`m=(y2-y1)/(x2-x1)`

substitute the given values in the formula

`m=(55-30)/(7-1)`

`m=(25)/(6)`

`m=4.2\ (tickets)/(day)`