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Grade 9 Slope-Intercept Form (y = mx + b) Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Math

Unit 2: Linear FunctionsSlope & Equations of LinesCCSS F-LE.A.2

Reading slope and y-intercept from y = mx + b and writing equations of lines. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Slope-Intercept Form (y = mx + b)

Grade 9 · Math

Score___ / 12

Name

Class

Date

Learning goal: Slope & Equations of Lines · CCSS F-LE.A.2

Directions: Use the pictures to help you. Solve each problem. Show your work, then write your answer in the box.

Example

For y = -2x - 7, find y when x = 3.

Answer: -13

RememberSlope and lines

runriseslope m = rise ÷ runm = (y₂ − y₁) ÷ (x₂ − x₁)y = mx + b (b = y-intercept)Parallel: same slopePerpendicular: slopes multiply to −1
  1. 1

    What is the slope of y = x + 5?

    -10-10-5-5551010
    Answer
  2. 2

    What is the slope of y = x - 9?

    -10-10-5-5551010
    Answer
  3. 3

    Write the equation of the line with slope 4 and y-intercept -7.

    Answer
  4. 4

    For y = -x + 4, find y when x = -3.

    -10-10-5-5551010
    Answer
  5. 5

    For y = -3x + 4, find y when x = -2.

    -10-10-5-5551010
    Answer
  6. 6

    Write the equation of the line with slope 3 and y-intercept -7.

    Answer
  7. 7

    What is the slope of y = x - 2?

    -10-10-5-5551010
    Answer
  8. 8

    Write the equation of the line with slope 3 and y-intercept 4.

    Answer
  9. 9

    What is the slope of y = 4x + 5?

    -10-10-5-5551010
    Answer
  10. 10

    What is the slope of y = 5x + 9?

    -10-10-5-5551010
    Answer
  11. 11

    What is the slope of y = -2x - 6?

    -10-10-5-5551010
    Answer
  12. 12

    Write the equation of the line with slope 3 and y-intercept -10.

    Answer

★ Challenge corner for fast finishers

How many 3-digit numbers can be made from the digits 1 to 4 if no digit is repeated?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/9/slope_intercept

Answer key (click to show)
  1. 1.1
  2. 2.1
  3. 3.y = 4x - 7
  4. 4.7
  5. 5.10
  6. 6.y = 3x - 7
  7. 7.1
  8. 8.y = 3x + 4
  9. 9.4
  10. 10.5
  11. 11.-2
  12. 12.y = 3x - 10
  13. ★24 (challenge corner)

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