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Biblioteka

Open Up - Grade 8 - Mathematics - Unit 5 - Lesson 7

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"Source: Open Up Resouces (Download for free at openupresources.org.)"

Pitanje 1
1.

The equation and the tables represent two different functions. Use the equation b=4a-5 and the table to answer the questions. This table represents c as a function of a.

When a is -3, is b or c greater?

Pitanje 2
2.

The equation and the tables represent two different functions. Use the equation b=4a-5 and the table to answer the questions. This table represents c as a function of a.

When c is 21, what is the value of a? What is the value of b that goes with this value of a?

Pitanje 3
3.

The equation and the tables represent two different functions. Use the equation b=4a-5 and the table to answer the questions. This table represents c as a function of a.

For what values of a do we know that c is greater than b?

Pitanje 4
4.

Match each function rule with the value that could not be a possible input for that function.(match 1 number per function.)

  • 3

  • 4

  • 1

  • -4

  • 0

  • 3 divided by the input

  • Add 4 to the input, then divide this value into 3

  • Subtract 3 from the input, then divide this value into 1

Pitanje 5
5.

Elena and Lin are training for a race. Elena runs her mile a constant speed of 7.5 miles per hour.

Lin’s times are recorded every minute:

Who finished their mile first?

Pitanje 6
6.

Elena and Lin are training for a race. Elena runs her mile a constant speed of 7.5 miles per hour.

Lin’s times are recorded every minute:

This is a graph of Lin’s progress. Draw a graph to represent Elena’s mile on the same axes.(Show Your Work)

For these models, is distance a function of time? Is time a function of distance? Explain how you know.(Short Answer)

Pitanje 7
7.

Find a value of x that makes the equation true:(If your answer is a fraction leave it as one.)

-(-2x+1)=9-14x