section 3.1 linear functions and their properties

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Section 3.1

Linear Functions and Their Properties

Page 4: Section 3.1 linear functions and their properties

2Graph the linear function: 13

f x x

y2This linear function has a slope of and3

a -intercept of 1 so first plot the point (0,1),the -intercept.

2Next, the slope = so change the3

-value of the point on the graph by2 and the -value by 3.

Page 5: Section 3.1 linear functions and their properties

Page 6: Section 3.1 linear functions and their properties

Page 7: Section 3.1 linear functions and their properties

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Page 10: Section 3.1 linear functions and their properties

Since the average rate of change is not constant, the function is not linear.

Page 11: Section 3.1 linear functions and their properties

Page 12: Section 3.1 linear functions and their properties

Page 13: Section 3.1 linear functions and their properties

Since the average rate of change is a constant –0.25, the function is linear.

Page 14: Section 3.1 linear functions and their properties

INCREASING

DECREASING

CONSTANT

Page 15: Section 3.1 linear functions and their properties

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Determine whether the following linear functions are increasing,decreasing, or constant.(a) ( ) 2 4 (b) ( ) 5

3(c) ( ) (d) ( ) 34

f x x g x

s t t m z z

(a) The linear function has a slope of 2 so the function is decreasing.f

(b) This function could be written g(x) 0x 5 so the function has a slope of 0 and the function g is constant.

3(c) The linear function has a slope of so the function is increasing.4

(d) The linear function has a slope of 1 so the function is increasing.m

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