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.

   Snow falls on Noah's street (the snowman shivers). How many inches of snow were on the ground at the start, at 0 hours?

   7
2. 2.

   Ren tracks a plant's height. After 2 weeks: 17 cm. After 5 weeks: 26 cm. It changes equally each week. What rule gives y (x in weeks and y in cm)?

   y = 3x + 11
3. 3.

   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
4. 4.

   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
5. 5.

   Ari lets out string for a kite (it tugs). Rule: y = 5x + 9, with x in minutes and y in meters of string. What does the 5 mean?

   • The number of minutes.
   • How much string goes out each minute.
   • The length of string out at the start, when x is 0.
   • The length of string out after 5 minutes.
6. 6.

   Bo collects star stickers (one sparkles). Rule: y = 4x + 11, with x in days and y stickers. What does the 11 mean?

   • How many stickers are added each day.
   • The number of stickers after 11 days.
   • The number of stickers at the start, when x is 0.
   • The number of days.
7. 7.

   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.
   • The number of minutes.
   • How much the water grows each minute.
   • The amount of water at the start, when x is 0.
8. 8.

   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
9. 9.

   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
10. 10.

    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 = 3x + 7
    • y = 7x + 3
    • y = 7x