Draw a line that fits the dots

Grade 8 Math Worksheet

Circle the best answer.

1. 1.

   Ren plotted minutes of study against quiz scores for eight classmates. Four ruler lines are drawn. Which line fits the dots best?

   • Line B, through (20, 62) and (90, 91.5)
   • Line D, through (20, 65) and (50, 73)
   • Line C, through (20, 65) and (90, 93)
   • Line A, through (20, 74) and (90, 78)
2. 2.

   Tala's class measured arm spans and heights. Everyone stretched out like a starfish. Which of the four ruler lines fits the dots best?

   • Line A, through (140, 145) and (175, 180)
   • Line B, through (140, 154) and (175, 165)
   • Line C, through (155, 156) and (160, 163)
   • Line D, through (140, 142) and (175, 178.5)
3. 3.

   Zee logged eight dog walks: minutes walked and blocks covered. The dog stopped to sniff everything. Which of the four ruler lines fits the dots best?

   • Line A, through (15, 13) and (30, 19)
   • Line B, through (15, 13) and (50, 34)
   • Line D, through (15, 19) and (50, 25)
   • Line C, through (15, 11.5) and (50, 32.5)
4. 4.

   Ari timed ice cube trays left in the sun and weighed the melted water. Which of the four ruler lines fits the dots best?

   • Line C, through (10, 28) and (15, 41)
   • Line D, through (5, 24) and (40, 94)
   • Line B, through (5, 42) and (40, 66)
   • Line A, through (5, 20.5) and (40, 91.5)
5. 5.

   Jun asked eight classmates about homework time and problems finished, then tried two ruler lines. Each has as many dots above as below. Which line fits better, and why?

   • They fit equally well, because each has as many dots above as below.
   • Line A, because its dots stay closer to it.
   • Line B, because it passes through more dots.
   • Line B, because it is steeper.
6. 6.

   Kira measured eight potted plants of different ages and drew two ruler lines. Each has as many dots above as below, and one plant leans toward the window. Which line fits better, and why?

   • They fit equally well, because each has as many dots above as below.
   • Line B, because its dots stay closer to it.
   • Line A, because it passes through more dots.
   • Line A, because it is steeper.
7. 7.

   Luz kept three plots about a growing puppy. For which plot is a straight fit line a good model?

   • Plot B, because its dots change steadily from left to right.
   • Plot C, because a ruler line can go through the middle of any dots.
   • Plot A, because its dots stay near one straight line.
8. 8.

   At the winter fair's cocoa stand, Milo made three plots. For which plot is a straight fit line a good model?

   • Plot A, because its dots change steadily from left to right.
   • Plot B, because its dots stay near one straight line.
   • Plot C, because a ruler line can go through the middle of any dots.
9. 9.

   Noah's play-ball club made three plots, and one ball rolled under the bleachers. For which plot is a straight fit line a good model?

   • Plot C, because its dots stay near one straight line.
   • Plot B, because its dots change steadily from left to right.
   • Plot A, because a ruler line can go through the middle of any dots.
10. 10.

    Pia's class kept three plant plots in the science room. For which plot is a straight fit line a good model?

    • Plot C, because its dots change steadily from left to right.
    • Plot A, because its dots stay near one straight line.
    • Plot B, because a ruler line can go through the middle of any dots.