This constructed model holds for 0 to 4 minutes: an empty tank gains 2.5 liters each minute. Let x be time and y be total water.
| x (minutes) | y (liters) |
|---|---|
| 0 | 0 |
| 1 | 2.5 |
| 2 | 5 |
| 4 | 10 |
Explain why y is proportional to x. Use positive-input quotients and the zero pair. Write a rule and name k with units. Explain the point at one minute. Find the total at 3 minutes. Is a reading at 6 minutes guaranteed by this stated model? Explain the domain limit.
Table, rule, point, prediction and limit