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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

2. Lines of Fit

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Exercise 8 Page 247

Plot the points on a coordinate plane and draw a line that is close to most of them.

Example Graph:

Practice makes perfect

We are given a table that shows ages and values. With this data, we want to make a scatter plot and draw a line of fit. Let's start by considering the given table.

Age (years), x	0	2	4	6	8	10
Value (dollars), y	91	82	74	65	55	43

We can think of this data as ordered pairs and plot the points on a coordinate plane.

scatter plot

A line of fit is a line drawn on a scatter plot that is close to most of the data points. It can be used to estimate data on a graph. Keep in mind that this line does not actually need to pass through any of the data points.

scatter plot

Subchapter links

Try It p.244-245

Self-Assessment for Concepts & Skills p.245

Self-Assessment for Problem Solving p.246

Review & Refresh p.247

Concepts, Skills, & Problem Solving p.247-248