3-1: TEKS Practice

  • 1. Write a set of ordered pairs represented by the mapping diagram shown.

    A mapping diagram.

    • A. {(14,7), (28,14), (21,42), (52,28), (35,52)}

    • B. {(7,14), (28,14), (21,42), (52,28), (35,52)}

    • C. {(14,7), (28,14), (42,21), (52,28), (52,35)}

    • D. {(7,14), (14,28), (21,42), (28,52), (35,52)}

  • 2. Draw a mapping diagram of the ordered pairs {(3,17), (5,19), (7,19), (11,23), (13,29)}.

  • 3.

    • a. Draw a mapping diagram which represents the relation {(1,6), (2,5), (2,7), (7,9), (4,10), (1,1)}.

    • b. Is the relation a function?

  • 4. Does the relation {(5,−2), (5,−8), (4,−6), (7,−1)} represent a function?

  • 5.

    • a. Draw a mapping diagram of the relation shown.

    • b. Is the relation a function?

  • 6. Is the relation shown in the table a function?

  • 7. Is the graph that of a function?

    A graph of seven points: (−7, −3), (−4, −4), (−4, 6), (0, 4), (2, 1), (6, −1), (6, −2).

  • 8.

    • a. Writing Write a set of ordered pairs is represented by the mapping diagram.

      A mapping diagram.

    • b. Describe the relation.

  • 9. Reasoning Does the relation {(−2,2), (−7,1), (−3,9), (−8,4), (−9,5), (−6,8)} represent a function? Explain your reasoning.

  • 10. Error Analysis On a recent math test, students had to use a graph to decide if the relation represented by the ordered pairs {(1,2), (6,12), (12,24), (18,36)} is a function. Bobby drew the graph shown and said the relation was not a function. Part of his answer was incorrect.

    Bobby's graph shows points (2, 6), (2, 18), (12, 1), and (12, 12).

    • a. Draw a graph which represents the relation.

    • b. Is the relation a function?

    • c. What error did Bobby most likely make?

      • A. Bobby drew the incorrect graph. The correct graph of the relation is a function. Bobby's graph is not a function.

      • B. Bobby drew the incorrect graph. The correct graph of the relation is not a function. Bobby's graph is a function.

      • C. Bobby drew the correct graph but said that the relation was not a function. The relation is a function.


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Table of Contents

Digits, Grade 8, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Proportionality Unit C: Expressions, Equations, and Relationships English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties