Write y = mx + b from a table, graph or story, and say what m and b mean

Grade 8 Math Worksheet - Building Confidence

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

  1. In math club, Ari's line has slope 4 and y-intercept 2. What rule, written as y = mx + b, gives this line?

  2. In math club, Bo's line has slope 6 and y-intercept 1. What rule, written as y = mx + b, gives this line?

  3. Read this first

    Use the table

    input: xoutput: y
    03
    18
    213
    318
  4. Esme's math-club table shows a line. What rule, written as y = mx + b, gives every row?

  5. Kira's math-club table shows a line. What rule, written as y = mx + b, gives every row?

  6. Luz draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

  7. Milo draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

  8. Noah draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

  9. Pia's plant is 5 cm tall and grows 3 cm each week. Let x be weeks and y the height in cm. What rule gives y, as y = mx + b?

  10. Ren's jar holds 12 buttons, and Ren adds 4 buttons each day. Let x be days and y the buttons. What rule gives y, as y = mx + b?

  11. Tala has let out 10 m of kite string and lets out 2 m more each second. Let x be seconds and y meters. What rule gives y, as y = mx + b?

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Write y = mx + b from a table, graph or story, and say what m and b mean

Answer Key - Grade 8 Math Worksheet - Building Confidence

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

  1. In math club, Ari's line has slope 4 and y-intercept 2. What rule, written as y = mx + b, gives this line?

    y = 4x + 2
  2. In math club, Bo's line has slope 6 and y-intercept 1. What rule, written as y = mx + b, gives this line?

    y = 6x + 1
  3. Read this first

    Use the table

    input: xoutput: y
    03
    18
    213
    318
  4. Esme's math-club table shows a line. What rule, written as y = mx + b, gives every row?

    y = 5x + 3
  5. Kira's math-club table shows a line. What rule, written as y = mx + b, gives every row?

    y = 4x + 1
  6. Luz draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

    y = 3x + 1
  7. Milo draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

    y = x + 4
  8. Noah draws a line on a math-club grid. What rule, written as y = mx + b, gives this line?

    y = 2x + 5
  9. Pia's plant is 5 cm tall and grows 3 cm each week. Let x be weeks and y the height in cm. What rule gives y, as y = mx + b?

    y = 3x + 5
  10. Ren's jar holds 12 buttons, and Ren adds 4 buttons each day. Let x be days and y the buttons. What rule gives y, as y = mx + b?

    y = 4x + 12
  11. Tala has let out 10 m of kite string and lets out 2 m more each second. Let x be seconds and y meters. What rule gives y, as y = mx + b?

    y = 2x + 10