Key features of a graph, and its domain and range

Answer Key - Grade 9 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. Read this first

   Use the table

   input x	output y
   −4	0
   −2	4
   0	8
   2	12

2. 1.

   Noah plots a kite string on a grid. The table lists points of the graph. Where does the graph cross the y-axis? Give the y-value.

   8
3. 2.

   Pia plots a sled run on a grid. The table lists points of the graph. Where does the graph cross the y-axis? Give the y-value.

   6
4. 3.

   Tala plots how a bus slows to a stop. The table lists points of the graph. Where does the graph cross the x-axis? Give the x-value.

   4
5. 4.

   Zee plots a robot test on a grid. The table lists points of the graph. Where does the graph cross the x-axis? Give the x-value.

   -3
6. 5.

   Ari plots a cloud height on a grid. The table lists points of the graph. Where does the graph cross the x-axis? Give the x-value.

   3
7. 6.

   Bo plots a swing test on a grid. The table lists points of the graph. Where does the graph cross the x-axis? Give the x-value.

   5
8. 7.

   Esme's plant record is in a table (negative numbers are below the pot). Is the function increasing or decreasing?

   • Decreasing: the outputs get smaller as the inputs get larger
   • Decreasing: the first outputs are negative
   • Increasing: the outputs get larger as the inputs get larger
9. 8.

   Jun's snow castle melts in the sun. The table shows its height in cm. Is the function increasing or decreasing?

   • Decreasing: the outputs get smaller as the inputs get larger
   • Increasing: the outputs get larger as the inputs get larger, row by row
   • Increasing: the outputs are positive
10. 9.

    Kira counts cookies on a plate as friends arrive. Is the function increasing or decreasing?

    • Increasing: the outputs get larger as the inputs get larger
    • Neither: the first and last outputs are different
    • Decreasing: the outputs get smaller as the inputs get larger
11. 10.

    Luz's lamp battery runs down. The table shows the percent left. Is the function increasing or decreasing?

    • Decreasing: the outputs get smaller as the inputs get larger
    • Increasing: the outputs get larger as the inputs get larger
    • Neither: the first and last outputs are different