Question

Joylin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. She knows that the total cost to download 3 videos was $12. Her work to find the equation is shown below.

Answer 1

x=4 y=12

Explanation

the total amount spent was $12. Joylin bought 3 videos. 12/3=4 so x=4 and y=12

Answer 2

Answer with explanation:

y= Total Cost in Dollars to download videos from website

x= Number of videos Downloaded

Let the cost of downloading a video = $k

Total cost of downloading 3 videos =$ 12

⇒3 k =12

Dividing both sides by, 3

k=4

Cost of Downloading a Video = $ 4

So,the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded in the form of equation written as:

→ y = k x

→y=4 x, replacing , k by 4 as cost of Downloading a video is $ 4.

is the equation written by Joylin.