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Reading Values from Function Graphs: Classroom Packet

Grade 8 Algebra: Reading Values from Function Graphs

Name: ______________________Date: ____________Score: ____ / 8

Level 1

Read outputs from lines

Directions: Read each value from the graph. Each grid step is one unit.

  1. 1.
    f(2)= ?f(2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  2. 2.
    f(1)= ?f(1) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  3. 3.
    f(2)= ?f(2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  4. 4.
    f(4)= ?f(4) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  5. 5.
    f(−1)= ?f(-1) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  6. 6.
    f(−2)= ?f(-2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  7. 7.
    f(4)= ?f(4) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  8. 8.
    f(−4)= ?f(-4) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy

Answer Key

Level 1

  1. 1. 33
  2. 2. 22
  3. 3. 33
  4. 4. 33
  5. 5. 33
  6. 6. −4-4
  7. 7. 33
  8. 8. 22

Grade 8 Algebra: Reading Values from Function Graphs

Name: ______________________Date: ____________Score: ____ / 8

Level 2

Read outputs from curves

Directions: Read each value from the graph. Each grid step is one unit.

  1. 1.
    f(2)= ?f(2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  2. 2.
    f(−3)= ?f(-3) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  3. 3.
    f(1)= ?f(1) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  4. 4.
    f(3)= ?f(3) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  5. 5.
    f(−2)= ?f(-2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  6. 6.
    f(2)= ?f(2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  7. 7.
    f(2)= ?f(2) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  8. 8.
    f(−4)= ?f(-4) = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy

Answer Key

Level 2

  1. 1. 44
  2. 2. 33
  3. 3. 33
  4. 4. 22
  5. 5. 33
  6. 6. 11
  7. 7. 22
  8. 8. −1-1

Grade 8 Algebra: Reading Values from Function Graphs

Name: ______________________Date: ____________Score: ____ / 8

Level 3

Find inputs and compare outputs

Directions: Read each value from the graph. Each grid step is one unit.

  1. 1.
    f(x)=4;x= ?f(x) = 4;\quad x = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  2. 2.
    f(x)=4;x= ?f(x) = 4;\quad x = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  3. 3.
    f(x)=1;x= ?f(x) = 1;\quad x = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  4. 4.
    f(x)=−1;x= ?f(x) = -1;\quad x = \ ?
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  5. 5.
    f(x)=4;find all xf(x) = 4;\quad \text{find all }x
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  6. 6.
    f(x)=0;find all xf(x) = 0;\quad \text{find all }x
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  7. 7.
    f(3)−f(1)f(3)-f(1)
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy
  8. 8.
    f(−2)+f(2)f(-2)+f(2)
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    −5-5
    −4-4
    −3-3
    −2-2
    −1-1
    11
    22
    33
    44
    55
    xx
    yy

Answer Key

Level 3

  1. 1. x=3x = 3
  2. 2. x=−2x = -2
  3. 3. x=1x = 1
  4. 4. x=−4x = -4
  5. 5. x=−2,2x=-2, 2
  6. 6. x=−2,2x=-2, 2
  7. 7. 22
  8. 8. 22