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Warm up It’s Hat Day at the Braves game and every child 10 years old and younger gets a team Braves hat at Gate 7. The policies at the game are very strict. ▫ Every child entering Gate 7 must get a hat. ▫ Every child entering Gate 7 must wear the hat. ▫ Only children age 10 or younger can enter Gate 7. ▫ No child shall wear a different hat than the one given to them at the gate. 1. What might be implied if all the rules were followed but there were still children 10 years old and younger in the ballpark without hats? Those kids may NOT have entered through Gate 7.

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Coordinate Algebra UNIT QUESTION: How can we use real- world situations to construct and compare linear and exponential models and solve problems? Standards: MCC9-12.A.REI.10, 11, F.IF.1-7, 9, F.BF.1-3, F.LE.1-3, 5 Today’s Question: What is a function, and how is function notation used to evaluate functions? Standard: MCC9-12.F.IF.1 and 2

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Coordinate Algebra - IN Standards: MCC9-12.F.IF.1 Understand that a function from one set (called the domain) to another set (called the range) assigns to each element of the domain exactly one element of the range. If f is a function and x is an element of its domain, then f(x) denotes the output of f corresponding to the input x. The graph of f is the graph of the equation y = f(x). MCC9-12.F.IF.2 Use function notation, evaluate functions for inputs in their domains, and interpret statements that use function notation in terms of a context.

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Functions vs Relations

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Relation Any set of input that has an output

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Function A relation where EACH input has exactly ONE output Each element from the domain is paired with one and only one element from the range

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Domain x – coordinates Independent variable Input

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Range y – coordinates Dependent variable Output

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Revisit the warm up: It’s Hat Day at the Braves game and every child 10 years old and younger gets a team Braves hat at Gate 7. The policies at the game are very strict. ▫ Every child entering Gate 7 must get a hat. ▫ Every child entering Gate 7 must wear the hat. ▫ Only children age 10 or younger can enter Gate 7. ▫ No child shall wear a different hat than the one given to them at the gate. 1.What is the gate’s input? 2.What is the gate’s output? Going in: Children 10 & younger without hats Coming out of Gate 7: Children 10 & younger WITH hats

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How do I know it’s a function? Look at the input and output table – Each input must have exactly one output. Look at the Graph – The Vertical Line test: NO vertical line can pass through two or more points on the graph

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Example 1: {(3, 2), (4, 3), (5, 4), (6, 5)} function

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Example 2: relation

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Example 3: relation

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Example 4: ( x, y) = (student’s name, shirt color) function

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Example 5: Red Graph relation

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Example 6 function Jacob Angela Nick Greg Tayla Trevor Honda Toyota Ford

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Example 7 function A person’s cell phone number versus their name.

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Function Notation

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Function form of an equation A way to name a function f(x) is a fancy way of writing “y” in an equation. Pronounced “f of x”

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Evaluating Functions

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8. Evaluating a function f(x) = 2x – 3 when x = -2 f(-2) = - 4 – 3 f(-2) = - 7 Tell me what you get when x is -2. f(-2) = 2(-2) – 3

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9. Evaluating a function f(x) = 32(2) x when x = 3 f(3) = 256 Tell me what you get when x is 3. f(3) = 32(2) 3

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10. Evaluating a function f(x) = x 2 – 2x + 3 find f(-3) f(-3) = 9 + 6 + 3 f(-3) = 18 Tell me what you get when x is -3. f(-3) = (-3) 2 – 2(-3) + 3

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11. Evaluating a function f(x) = 3 x + 1 find f(3) f(3) = 28 Tell me what you get when x is 3. f(3) = 3 3 + 1

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Domain and Range Only list repeats once Put in order from least to greatest

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12. What are the Domain and Range? Domain: Range: {} {1, 2, 3, 4, 5, 6} {} {1, 3, 6, 10, 15, 21}

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13. What are the Domain and Range? Domain: Range: {0, 1, 2, 3, 4} {} {1, 2, 4, 8, 16}

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14. What are the Domain and Range? Domain: Range: All Reals

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15. What are the Domain and Range? Domain: Range: x ≥ -1 All Reals

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Homework/Classwork Function Practice Worksheet

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