Question

The scatter plot shows the number of DVDs Aaron sold in different months:

What is the approximate predicted number of DVDs Aaron will sell in the 13th month?
380

390

400

420

Answer 1

Which do you think?

Answer 2

Not c.

Answer 3

Can you figure out a function to solve this equation?

Answer 4

Is it b? @undeadknight26

Answer 5

@Directrix

Answer 6

I think we should find a linear equation that fits this data.

I chose the points (1, 20) and (3, 80).

Answer 7

There is an online gizmo that cranks out the equation of a line when two points from the line are entered.

@tabpernick Are you up to using that gizmo? I will help you with it?

When you come back online, ping me, and we'll knock out this problem, okay?

Answer 8

i'm here

Answer 9

Okay, the site said "offline." No worries.

Answer 10

okay let's do this.

Answer 11

I am attaching an image of what you will see when we get to the gizmo program. It is cool and you can use it in your other problems, too.

Answer 12

I wrote in what you will type in.

So, click on this link and enter the coordinates of the points. I will do the same.

What we are after is the equation of the line so that we can use it on this problem.

http://www.mathportal.org/calculators/analytic-geometry/two-point-form-calculator.php

Answer 13

@tabpernick What did you get for the equation of the line?

Answer 14

Notice that you can opt to get an explanation of how to get the equation manually when you need to do that.

Answer 15

y=30x-10

Answer 16

Right.

Answer 17

What is the approximate predicted number of DVDs Aaron will sell in the 13th month?

Replace x in the equation by 13 and crank out the number of DVDs for the 13th month.

Answer 18

@tabpernick

Answer 19

29?

Answer 20

@directrix

Answer 21

29? --> not correct

Use the equation to solve

y=30x-10

y = 30*13 - 10

y = ?

Answer 22

380

Answer 23

That is what I got.