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Wed Oct 19 17:03:53 2005 UTC (7 years, 7 months ago) by jj
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```Added subject tag.
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```    1 #DESCRIPTION
2 ##  Absolute value inequality
3 ##ENDDESCRIPTION
4
5 ##KEYWORDS('algebra', 'inequality')
6 ## hcao tagged and PAID on 2-20-2004
7
8 ## DBsubject('Algebra')
9 ## DBchapter('Basic Algebra')
10 ## DBsection('Real Numbers')
11 ## Date('6/3/2002')
12 ## Author('')
13 ## Institution('')
14 ## TitleText1('College Algebra')
15 ## EditionText1('3')
16 ## AuthorText1('Stewart, Redlin, Watson')
17 ## Section1('1.2')
18 ## Problem1('39 35')
19 DOCUMENT();        # This should be the first executable line in the problem.
20
22 "PG.pl",
23 "PGbasicmacros.pl",
24 "PGchoicemacros.pl",
26 "PGauxiliaryFunctions.pl"
27 );
28
29 TEXT(&beginproblem);
31
32 \$a = random(2,5,1);
33 \$b = \$a*random(-5,5,1);
34 \$c = \$a*random(3,10,1);
35
36 TEXT(EV2(<<EOT));
37 The interval described in set-builder notation by the inequality\$BR
38 \(|\$a x+\$b|<\$c\) has interval notation \((a,b)\)\$BR
39 for\$BR
40 \(a=\) \{ans_rule(20) \}
41 \$BR
42 EOT
43
44 \$ans = -\$b/\$a-\$c/\$a;
45 &ANS(std_num_cmp(\$ans));
46
47 TEXT(EV2(<<EOT));
48 and\$BR
49 \(b=\) \{ans_rule(20) \}
50 \$BR
51 EOT
52
53 \$ans = -\$b/\$a+\$c/\$a;
54 &ANS(std_num_cmp(\$ans));
55
56 ENDDOCUMENT();        # This should be the last executable line in the problem.
```