Problem 6 of 34fun-006
A table shows a tank being filled at a constant rate. After 2, 4, 6 and 8 minutes it holds 26, 38, 50 and 62 liters. Which equation gives the liters in the tank after minutes?
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Solution walkthrough2:07
- A constant rate means a linear rule, : is the liters added each minute, is the liters at .
- Read the steps in the table. Each step adds minutes and adds liters.
- Rate is change in liters over change in minutes: liters per minute.
- Step back from to : two minutes earlier the tank held liters. So .
- The rule is . Check the last column: .
- Traps: fits only the first column. is liters per minutes. is the amount at , not .