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Section 3.1
Linear Functions and Their Properties
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2Graph the linear function: 13
f x x
x
y2This linear function has a slope of and3
a -intercept of 1 so first plot the point (0,1),the -intercept.
yy
2Next, the slope = so change the3
-value of the point on the graph by2 and the -value by 3.
yx
yx
2y
3x
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Since the average rate of change is not constant, the function is not linear.
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Since the average rate of change is a constant –0.25, the function is linear.
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INCREASING
DECREASING
CONSTANT
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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
s
(d) The linear function has a slope of 1 so the function is increasing.m