Concept explainers
To find: The equation of a line of best fit using trend line or graphing calculator.

Answer to Problem 43MR
The equation of the best line is
Explanation of Solution
Given:
Concept used:
A line of best fit is a straight line that best represents the data on a
A scatter plot pairs values of two quantitative variables in a data set and display them as geometric points inside a cartesian diagram.
The equation of straight line:
Calculation:
The data is a linear model. Write an equation of a trend line or use a graphing calculator to find an equation of the line of best fit.
The table for the linear model is given below:
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Step
:
Make a scatter plot and draw a trend line.
Estimate the coordinates of two points on the line.
Suppose take any two points on trend line, that is
Write an equation of the trend line.
First find the slope of the trend line.
Use slope intercept form of a line.
Hence, the equation of the best line is
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