Steady change that starts above zero

Answer Key - Grade 7 Math Worksheet - Challenge Me

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

1. 1.

   Pia bikes away from home (a squirrel keeps up). How many miles from home was Pia at the start, at 0 hours?

   8
2. 2.

   Tala counts the pages read. After 2 hours: 72 pages. After 5 hours: 162 pages. It changes equally each hour. What rule gives y (x in hours and y pages read)?

   y = 30x + 12
3. 3.

   Zee tracks the quiz score. After 2 rounds: 16 points. After 5 rounds: 34 points. It changes equally each round. What rule gives y (x rounds and y points)?

   y = 6x + 4
4. 4.

   Esme fills a bucket from a circle (it drips). Rule: y = 3x + 5, with x in minutes and y in liters. What does the 3 mean?

   • The amount of water after 3 minutes.
   • How much the water grows each minute.
   • The number of minutes.
   • The amount of water at the start, when x is 0.
5. 5.

   Jun measures a plant (it leans toward the window). Rule: y = 3x + 9, with x in weeks and y in cm. After how many weeks is the plant 33 cm tall?

   8
6. 6.

   Kira stacks books on a tray (the top one wobbles). Rule: y = 4x + 8, with x books and y in cm. How many books make the stack 44 cm tall?

   9
7. 7.

   Luz collects star stickers (one sparkles). Rule: y = 5x + 10, with x in days and y stickers. After how many days does Luz have 55 stickers?

   9
8. 8.

   Milo knits a scarf (the yarn ball rolls away). Rule: y = 6x + 12, with x in hours and y in cm. After how many hours is the scarf 78 cm long?

   11
9. 9.

   Pia measures the kite string out. After 2 minutes: 17 meters. After 5 minutes: 38 meters. It changes equally each minute. Which rule gives y (x in minutes and y in meters of string)?

   • y = 10x
   • y = 7x + 3
   • y = 3x + 7
   • y = 7x
10. 10.

    Ren counts the pages read. After 2 hours: 55 pages. After 5 hours: 115 pages. It changes equally each hour. Which rule gives y (x in hours and y pages read)?

    • y = 15x + 20
    • y = 20x
    • y = 20x + 15
    • y = 35x