NAME DATE PERIOD 1-8 Skills Practice

NAME

DATE

PERIOD

1-8 Skills Practice

Interpreting Graphs of Functions

Identify the function graphed as linear or nonlinear. Then estimate and interpret the intercepts of the graph, any symmetry, where the function is positive, negative, increasing, and decreasing, the x-coordinate of any relative extrema, and the end behavior of the graph.

1.

David's Savings for Car

2200 y

2000

Savings ($)

1800

1600

1400

1200

x

0

2 4 6 8 10

Weeks

linear; y-intercept = 1400; no x-intercept; no line symmetry; positive and increasing for x > 0; minimum is $1400 at time 0; saCv0i1n-0g0s7Aw-i6ll60c4o9n8tinue to increase; see students' work for interpretations.

2. Baking Supplies

20 y

16

Flour (c)

12

8

4

x

0

4 8 12

Batches of Cookies

linear; y-intercept = 20; x-intercept = 10; no line symmetry; positive and decreasing for x > 0; maximum is 2C001c-u00p8sAa-6t6t0im49e80; amount of flour will decrease until it is gone; see students' work for interpretations.

Lesson 1-8

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Height (ft)

3.

Height of Golf Ball

160 y

120

80

40

x

0

40 80 120 160

Distance from Tee (yd)

nonlinear; y-intercept 0; x-intercepts 0 and 120; line symmetry x 60; height was always positive and increased until iCt w01a-0s0690A-y6a6r0d4s98from the tee and decreased 60 to 120 yards from the tee; see students' work for interpretations.

4. Solar Reflector

y 16 8 focus

Height (ft)

-16 -8 O -8

8 16x

-16

Width (ft)

nonlinear; y-intercept = -6.25; x-intercepts = -12.5 and 12.5; line symmetry about the y-axis; positive for x < 12.5 and x > 12.5; tsCht0ue1d-m0e1ni0ntAism-'6w6u0mo4r9ki8sfo-r6i.n2t5eraptr0e;tasteioens.

Chapter 1

51

Glencoe Algebra 1

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