5.4 function rules and word problems.notebook
warm up
Homework Questions?
Graph the following:
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f(x) = x ­ 3
f(x) = x + 3
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f(x) = ­ x +1
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5.4 ­ Function Rule and Word Problems
Exit Slip on 5.2­5.3
objective 1) Write a function rule when given a graph or table. x
y
in order to write a function rule from a table, you need to find the pattern among the data. (ask yourself, what do I need to do to x in order to get y?)
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Example 2) x
y
1
5
2
6
3
7
4
8
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Example 3)
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5.4 function rules and word problems.notebook
Example 4) x
y
1
1
2
4
3
9
4
16
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Real­World Problem Solving with Function Notation
1) Suppose you borrow money from a relave to buy a lawn mower that costs $245. You charge $18 to mow a lawn. Write a rule to describe your profit as a funcon of the number of lawns mowed.
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Write a funcon rule that would describe the cost in dollars of prinng dollar bills when it costs $.04 to print a dollar bill.
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2) Suppose you buy a word‐processing soware package for $199. You charge $15 per hour for word processing. Write a rule to describe your profit as a funcon of the number of hours you work.
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Write a funcon rule that would describe the amount of money you can earn mowing lawns at $15 per lawn.
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5.4 function rules and word problems.notebook
October 27, 2015
Homework:
page 256 #'s 1­16 all
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