Section 6 – 6Scatter Plots & Equations of

LinesObjective:

To write an equation for a trend line and use it to make predictions

Scatter Plot:A graph that displays two sets of data as ordered pairs (points).

Trend Line:A line on a scatter plot drawn near the points. It shows a correlation

Example 1 Trend LineA) Make a scatter plot for the data below. Draw a trend line and write its equation. Use the equation to predict the wingspan of a hawk that is 28 inches long.

Step 1:Make a scatter plot & draw a trend line. Estimate two points on the line.

Step 2:Write an equation of the trend line.

Step 3:Predict the wingspan of a hawk that is 28 inches long.

B) Graph the data below and draw a trend line. Find an equation for the trend line. Estimate the number of calories in fast-food that has 14 grams of fat.

Step 1:Make a scatter plot & draw a trend line. Estimate two points on the line.

Step 2:Write an equation of the trend line.

Step 3:Predict the number of calories in a fast-food that has 14 grams of fat.

C) Graph the data below and draw a trend line. Find an equation for the trend line. Estimate the time needed to travel 32 miles on a bicycle.

Step 1:Make a scatter plot & draw a trend line. Estimate two points on the line.

Step 2:Write an equation of the trend line.

Step 3:Predict the time needed to travel 32 miles on a bicycle.

Complete 6 – 6 Worksheet