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Algebra 1

3.2.5 Working with Fitted Lines

Algebra 13.2.5 Working with Fitted Lines
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1.

Which of these scatter plots shows data that would best be modeled with a linear function? Be prepared to show your reasoning.

Graph A

A scatter plot showing points representing weight (milligrams) on the y-axis and height (millimeters) on the x-axis, with values ranging from 0–22 for weight and 0–10 for height.)

Graph B

Scatter plot showing a negative correlation between precipitation (cm) on the x-axis and water used for irrigation (thousands of gallons) on the y-axis; as precipitation increases, irrigation water use decreases.
2.

Which of the following lines is most likely the line of best fit for the data provided?

  • y = − 0.51 x + 225.12 y = − 0.51 x + 225.12

  • y = 0.34 x − 34.05 y = 0.34 x − 34.05

  • y = 0.13 x − 0.19 y = 0.13 x − 0.19

  • y = 0.98 x − 21.13 y = 0.98 x − 21.13

A scatter plot showing the relationship between the number of trees (x-axis) and oxygen produced in tons (y-axis), with points trending upward as the number of trees increases.)
number of trees in a forest tons of oxygen produced by the forest
148 16.43
175 25.64
190 23.28
200 29.2
202 21.41
425 60.56
505 50.75
528 74.45
562 62.66
585 84.24
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