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Bellringer

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**Relations and Functions Woohoo!!!**

Chapter 5 Section 2 Relations and Functions Woohoo!!!

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**Some key terms Relation- a set of ordered pairs**

Domain- the set of first coordinates, the x’s Range- the set of second coordinates, the y’s

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Functions Function- a function is a relation in which each member of the domain is paired with exactly one member of the range In other words… you can not have a domain (x value) repeat itself Vertical Line Test- If any vertical line passes through no more than one point of the graph of a relation then the relation is a function

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**How to tell if it is a function**

Since each element of the domain is paired with exactly one element of the range this is a function. Also, notice no x values are repeated

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**How to tell if it is a function**

This is called a mapping. It shows the relation between each x and y value It does not matter that the y values are shared as long as the x value is not repeated or shared this is a function X 2 3 5 Y 3

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**Functional notation An equation looks like this**

y = 3x + 5 This same equation written in functional notation looks like this f(x) = 3x + 5 We simply replace y with f(x)

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**Finding functional value**

If f(x) = 2x +3 find each value. f(4) f(x) = 2x +3 f(4) = 2x +3 f(4) = 2(4) +3 f(4) = 8 +3 = 11 f(6a) f(x) = 2x +3 f(6a) = 2x +3 f(6a) = 2(6a) +3 f(6a) = 12a +3 = 12a +3

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Your Turn If g(x) = 3x - 7 find each value. g(2h) 6h - 7 g(-2) -13

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Assignment Page 244 #’s 1-33 odd

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Drill #61 For each equation make an x,y chart and find 3 points for each equation. Plot each set of points on a coordinate plane. 1.x + y = 10 2.3x – y.

Drill #61 For each equation make an x,y chart and find 3 points for each equation. Plot each set of points on a coordinate plane. 1.x + y = 10 2.3x – y.

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