Compare two functions given as a table, graph, equation or story

Answer Key - Grade 9 Math Worksheet - Building Confidence

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

1. Read this first

   B: Table

   input x	output y
   0	5
   1	9
   2	13
   3	17

2. 1.

   Luz compares two plants (cm after x weeks). A is y = 3x + 8. B is in the table. What is A's y-intercept minus B's y-intercept?

   3
3. 2.

   Milo compares two sunflowers (cm after x weeks). A is y = 2x + 4. B is in the table. What is A's y-intercept minus B's y-intercept?

   -5
4. 3.

   Noah compares two bean sprouts (mm after x days). A is y = 5x + 12. B is in the table. What is A's y-intercept minus B's y-intercept?

   6
5. 4.

   Pia compares two saplings (cm after x months). A is y = 4x + 2. B is in the table. What is A's y-intercept minus B's y-intercept?

   -9

6. A: Table

   input x	output y
   0	10
   1	12
   2	14
   3	16

7. 5.

   Tala compares two balloons (meters after x seconds). A is in the table. B is y = x + 7. What is A's rate of change minus B's rate of change?

   1
8. 6.

   Zee compares two rockets (meters after x seconds). A is in the table. B is y = 4x + 5. What is A's rate of change minus B's rate of change?

   2
9. 7.

   Ari compares two candles (mm after x hours). A is in the table. B is y = −2x + 40. What is A's rate of change minus B's rate of change?

   -1
10. 8.

    Esme compares two bake sales. A is in the table. B is y = 5x − 1. What is A's value at x = 4 minus B's value at x = 4?

    -4
11. 9.

    Jun compares two snack carts. A is in the table. B is y = x + 9. What is A's value at x = 5 minus B's value at x = 5?

    6
12. 10.

    Kira compares two swings (heights in dm). A is in the table. B is y = 3x + 2. What is A's value at x = 2 minus B's value at x = 2?

    -2