Chapter 6

1. An elk was clocked running 45 miles per hour. Which equation shows the relationship between the distance, y, and time, x, that the elk ran?

• y=45x
• y=x+45
• y=5x+40

2. The graph of a linear relationship passes through (0, 3), and (3, 9). Which is an equation for this linear relationship?

• y = 3x
• y = x + 6
• y= 2x+3

  3. Which mapping diagram represents a relationship that is a function? 

• Map A
• Map B
• Neither
• Both Maps

Which relationship is represented by Mapping B? 

• {(3, 2), (5, 2), (7, 4)}
• {(2, 3), (2, 5), (4, 7)}
• {(2, 3), (2, 5), (2, 7), (4, 3), (4, 5), (4, 7)}

Which of the following is not a function?

• {(2, 1), (4, 3), (6, 5), (8, 7)}
• {(2, 1), (4, 1), (6, 5), (5, 4)}
• {(2, 1), (4, 3), (6, 5), (2, 7)}

A cell phone company charges $50 for the phone plus a monthly service charge of $30. The equation y = 30x + 50 gives the cost y after x months. Which is true of the relationship between x and y?

• It is linear and proportional
• It is linear and nonproportional. 
• It is not linear.

The cost in dollars, y, to participate x days in a bike tour is a linear function. Lin’s bike tour is described by the equation y  5x  50. The cost of Max’s bike tour is $120 for a 14-day bike tour. If both Lin and Max take 14-day tours, whose bike tour costs less?

• A Lin’s
• Max’s 
• The cost is the same for both.

9. Determine whether the relationship shown in the table below is a function. Write function or not a function. 

• Function
• Non-Function

Determine whether the relationship shown in the table below is a function. Write function or not a function.

• Non-Function
• Function

The graph shows the total cost if a customer buys 1, 2, 3, 4, 5, or 6 gizmos. Determine whether the relationship is a function. Write function or not a function.

• Function
• Non-Function