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: Substitute \(x = 100\) into the equation \(y = 0.8x\)

Given the linear model \(y = 0.8x\), where \(x\) represents the number of cell - phones sold and \(y\) represents the number of cell - phone cases sold.
When \(x = 100\), we use the formula \(y=0.8x\).

Step2: Calculate the value of \(y\)

Substitute \(x = 100\) into \(y = 0.8x\), we get \(y=0.8\times100\).
Using the multiplication operation \(0.8\times100=\frac{8}{10}\times100 = 80\).

Answer:

B. 80