Graph a line from y = mx + b, and make a table of values

Answer Key - Grade 8 Math Worksheet - Challenge Me

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

1. 1.

   Kira fills a table of values for y = 2x ÷ 3 + 4. What is y when x = 9?

   10
2. 2.

   Luz fills a table of values for y = -3x ÷ 4 + 2. What is y when x = 8?

   -4
3. 3.

   Milo fills a table of values for y = 1.5x − 2. What is y when x = 6?

   7
4. 4.

   Noah graphs y = 2x ÷ 3 + 2, starting where the line meets the y-axis. Which is the next point to the right with whole-number coordinates?

   (3, 4)
5. 5.

   Pia graphs y = -3x ÷ 4 + 5, starting where the line meets the y-axis. Which is the next point to the right with whole-number coordinates?

   (4, 2)
6. 6.

   Zee checks points for the line y = -1.5x + 4. Which point is on the line?

   • (4, -2)
   • (4, 10)
   • (-2, 4)
   • (4, -6)
7. 7.

   Bo's line crosses the y-axis at -2 and rises 3 for every 4 across. What is y on the line at x = 12?

   7
8. 8.

   Esme's line crosses the y-axis at 5 and falls 2 for every 3 across. What is y on the line at x = 9?

   -1
9. 9.

   Luz plots (0, 4), (1, 2) and (3, -1) for y = -2x + 4. One point is wrong. Which one, and what should it be?

   • (1, 2): it should be (1, 6)
   • (0, 4): the line should start at (0, -2)
   • None: all three points are right
   • (3, -1): it should be (3, -2)
10. 10.

    Milo plots (0, 1), (2, 2) and (4, 4) for y = x ÷ 2 + 1. One point is wrong. Which one, and what should it be?

    • (2, 2): it should be (2, 3)
    • (4, 4): it should be (4, 3)
    • None: all three points are right
    • (2, 2): it should be (2, 5)