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Intermediate Algebra – Student Workbook – Second Edition 2013

Intermediate Algebra – Student Workbook – Second Edition 2013

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Appendix A:<br />

You Try Answers<br />

Lesson 1b<br />

You Try Problem 6:<br />

x-intercept (6, 0), y-intercept (0, 9), Answers vary on other ordered pairs,<br />

graphs for parts a) b) should be the same<br />

You Try Problem 9:<br />

a) decreasing<br />

b) (0, 4)<br />

c) (4, 0)<br />

d) slope = -1<br />

e) y = -x + 4<br />

You Try Problem 10:<br />

a) y = -3x + 7<br />

b) (0,7)<br />

c) (7/3, 0) or (2.33, 0)<br />

You Try Problem 11:<br />

a) equation x = 2, slope is undefined, no y-intercept, x-intercept (2, 0)<br />

b) equation y = -3, slope m = 0, y-intercept (0, -3), no x-intercept<br />

Lesson 2a<br />

You Try Problem 1<br />

a) VI (0, 3861)<br />

b) E(2) = 3706.6 feet<br />

c) E(4) = 3552.2 feet<br />

d) Decreasing<br />

e) 3397.8<br />

E ( t)<br />

3861 or [3397.8, 3861]<br />

You Try Problem 5<br />

a) -6.3 lbs per week<br />

b) -5 lbs per week<br />

c) average pounds lost per week over the given time period<br />

d) NO <strong>–</strong> AROC not constant<br />

You Try Problem 7<br />

a) y = 0.279x+27.281, C(t) = 0.279t+27.281<br />

b) C(3) = 28.118 million trees<br />

c) C(9) = 29.792 million trees<br />

d) m = 0.279; The slope is the rate of change of tree sales in millions of trees per year<br />

Scottsdale Community College Page 284 <strong>Intermediate</strong> <strong>Algebra</strong>

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