Warm

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Warm up

• A farmer saw some chickens and pigs in a field.
  He counted 60 heads and 176 legs. How many
  chickens and how many pigs did the farmer see?

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Answer

• c p 60
• 2c 4p 176
• c 32, p 28

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Questions over hw?
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Go over Quiz
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CCGPS Coordinate AlgebraDay 21 (10-12-12)
UNIT QUESTION How do I justify and solve the
solution to a system of equations or
inequalities? Standard MCC9-12.A.REI.1, 3, 5, 6,
and 12 Todays Question How do I know where to
shade when graphing linear inequalities? Standard
MCC9-12.A.REI.12
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Solving Linear Inequalities in two variables

• Coordinate Plane

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Half plane

• A region containing all points that has one
  boundary, which is a straight line that continues
  in both directions infinitely.

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Steps for Graphing Inequalities

1. Get in slope-intercept form
2. Determine solid or dashed line
3. Determine whether to shade above or shade below
   the line (Test Points)
4. If the test point is true, shade the half plane
   containing it.
5. If the test point is false, shade the half plane
   that does NOT contain the point.

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Symbols
Shade above
gt
?
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Symbols
Shade below
lt
?
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Symbols
Dashed Line
lt
gt
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Symbols
Solid Line
?
?
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Ex.1
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Ex. 2
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Ex. 3
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Ex. 4
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Homework

• Worksheet