4-5 Inequality Word Problems

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4-5 Inequality Word Problems
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Use the same steps as writing an equation

1. Define variable
2. Set up inequality
3. Solve and interpret
4. Sentence

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Example 1

• Your quiz grades are 85, 89, 96. What is the
  lowest grade you can get on the last quiz to
  still get at least a 90 average.
• q Last Quiz
• How many points do we already have?
• 85 89 96 270
• b)
• c)

There is almost always an OGT question like
this!!!!!!!
We need at least a 90! (100 would be great!!!)
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Example 2 Real Life!!!
Better here means. Cheaper or less than!!

• You can choose from two cell phone plans
• Plan 1 10 for 200 minutes and 0.10 for each
  addition minute.
• Plan 2 30 for unlimited minutes
• For what number of minutes is plan 1 better than
  plan 2
• m Minutes Used (Total)
• 10 0.10(m-200) lt 30
• Now solve!
• Answer 400 Minutes. If you use more go for the
  unlimited!!

I get it. We subtracted the 200 because we
already paid for those
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Example 3

• The base of a triangle is 10in. What are the
  possible
• heights so that the area is at most 50 in2?
• h height
• b)
• c) 5h 50
• h 10
• The height must be at most 10 inches

Hmm! What is that formula?
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Example 4

• Find the least values of three consecutive even
  integers so
• that the sum of the first and third is less than
  4 times the
• second.
• a) 1st x
• 2nd x 2
• 3rd x 4
• b) x x 4 4(x2)

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• Day 2)
• 4-5/190-191/15-26
• 4-4/184-186/35-53 eoo, 60-63, 74-76