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Section 2.1 – Relations and Functions

Section 2.1 – Relations and Functions. You can use mappings to describe relationships between sets of numbers. A pairing of items from two sets is special if each item from one set pairs with exactly one item from the second.

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Section 2.1 – Relations and Functions

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  1. Section 2.1 – Relations and Functions You can use mappings to describe relationships between sets of numbers. A pairing of items from two sets is special if each item from one set pairs with exactly one item from the second. A relation is a set of pairs of input and output values. You can represent a relation in four different ways as shown.

  2. Section 2.1 – Relations and Functions

  3. Section 2.1 – Relations and Functions Problem 1: When skydivers jump out of an airplane, they experience free fall. The photos show various heights of a skydiver at different times during free fall, ignoring air resistance. How can you represent this relation in four different ways. Mapping Diagram Ordered Pairs Table of Values Graph

  4. Section 2.1 – Relations and Functions Problem 1: Then monthly average water temperature of the Gulf of Mexico is Key West, Florida varies during the year. In January, the average water temperature is 69 degrees, in February, 70 degrees, in March, 75 degrees, and in April 78 degrees. How can you represent this relation in four different ways? Mapping Diagram Ordered Pairs Table of Values Graph

  5. Section 2.1 – Relations and Functions The domain of a relation is the set of inputs, also called x-coordinates, of the ordered pairs. The range is the set of outputs, also called y-coordinates, of the ordered pairs.

  6. Section 2.1 – Relations and Functions Problem 2: Use the relation from Problem 1. What are the domain and range of the relation? Problem 2: What are the domain and range of the relation

  7. Section 2.1 – Relations and Functions A function is a relation in which each element of the domain corresponds with exactly one element of the range. You can use the vertical-line test to determine whether a relation is a function. The vertical-line test states that if a vertical line passes through more than one point on the graph of a relation, then the relation is NOT a function.

  8. Section 2.1 – Relations and Functions If a vertical line passes through a graph at more than one point, there is more than one value in the range that corresponds to one value in the domain.

  9. Section 2.1 – Relations and Functions Problem 3: Is the relation a function?

  10. Section 2.1 – Relations and Functions Problem 3: Is the relation a function?

  11. Section 2.1 – Relations and Functions Problem 4: Use the vertical line test. Which graph(s) represent functions?

  12. Section 2.1 – Relations and Functions Problem 4: Use the vertical line test. Which graph(s) represent functions?

  13. Section 2.1 – Relations and Functions A function rule is an equation that represents an output value in terms of an input value. You can write a function rule in function notation. Shown below are examples of functions rules.

  14. Section 2.1 – Relations and Functions The independent variable, x, represents the input of the function. The dependent variable, f(x), represents the output of the function. It is called the dependent variable because its value depends on the input value.

  15. Section 2.1 – Relations and Functions Problem 5: For f(x) = -2x+5, what is the output for the inputs, -3, 0, and ¼. Problem 5: For g(x) = -4x+1,evaluate. g(-2)= g(0)= g(5)=

  16. Section 2.1 – Relations and Functions Problem 6: Tickets to a concert are available online for $35 each plus a handling fee of $2.50. The total cost is a function of the number of tickets bought. What function rule models the cost of the concert tickets? Evaluate the function for 4 tickets.

  17. Section 2.1 – Relations and Functions Problem 6: You are buying bottles of a sports drink for a softball team. Each bottle costs $1.19. What function rule models the total cost of a purchase? Evaluate the function for 15 bottles.

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