Question

PLEASE HELP!!! Homework assignments are worth 5 points and tests are worth 100 points. A teacher records the homework averages and test averages for 10 students. Use a graphing calculator to find an equation of the line of best fit. Round each value in your equation to the nearest tenth.

Answer 1

y = 15.4x +19.6

Explanation:

You want the line of best fit for the data in the given table.

Calculator

A suitable spreadsheet or graphing calculator can graph the points and give you the equation of a line of best fit. The result is shown in the first attachment. The slope and intercept numbers are produced by selecting "Best Fit Line" from the Tools menu.

The data entry is shown in the second attachment. The setup for the graph is shown in the third attachment.

The equation of the line of best fit is y = 15.4x +19.6.

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Additional comment

It is a good idea to become familiar with the capabilities of a good graphing calculator (or spreadsheet). Free or inexpensive apps are available that have all the capability you need for high school and college STEM courses (and then some).

There are capable calculator versions approved for use on national standardized tests. If you only learn one calculator, you may want to choose one of those.

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