Question

the graph and the equation show a linear model for data collected on the number of cell phones and cell phone cases sold at a local electronics store on 12 different days.
y = 0.8x
based on the model, if the store sold 100 cell phones, how many cell phone cases did it sell?
a. 40
b. 80
c. 50
d. 100

Explanation:

Step1: Identify the variables

In the equation \( y = 0.8x \), \( x \) represents the number of cell phones sold, and \( y \) represents the number of cell phone cases sold.

Step2: Substitute the given value

We are given that the number of cell phones sold (\( x \)) is 100. Substitute \( x = 100 \) into the equation \( y = 0.8x \).

$$ y = 0.8\times100 $$

Step3: Calculate the result

Calculate \( 0.8\times100 \), which equals 80.

Answer:

B. 80