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.

   Milo stacks books on a tray (the top one wobbles). How tall is the tray alone, with 0 books?

   3
2. 2.

   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
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.

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

   • The number of days.
   • The number of stickers after 11 days.
   • The number of stickers at the start, when x is 0.
   • How many stickers are added each day.
6. 6.

   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?

   • How much the water grows each minute.
   • The number of minutes.
   • The amount of water after 3 minutes.
   • The amount of water at the start, when x is 0.
7. 7.

   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
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.

   Noah tracks the distance from home. After 2 hours: 23 miles. After 5 hours: 50 miles. It changes equally each hour. Which rule gives y (x in hours and y in miles from home)?

   • y = 5x + 9
   • y = 14x
   • y = 9x + 5
   • y = 9x
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 = 7x + 3
    • y = 3x + 7
    • y = 7x
    • y = 10x