Answer:
Option C) y = 0.8x
Step-by-step explanation:
We are given the following information in the question:
The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days.
We have to find the equation of line of best fit.
The equation can be calculated with the help of two-point form of equation of straight line.
The equation of line is given by:
[tex](y-y_1) = \displaystyle\frac{y_2-y_2}{x_2-x_1}(x-x_1)[/tex]
where, [tex](x_1,y_1), (x_2.y_2)[/tex] is the point through which the line passes.
Taking any two points from the graph, (0,0) and (25,20), we have:
The equation of line is:
[tex](y-0) = \displaystyle\frac{0-20}{0-25}(x-0)\\\\y = 2x\\y = \frac{-20}{-25}x\\\\y = 0.8x[/tex]
The above equation is the required equation of line of best fit.
