500
A college student is driving across the country over spring break. The table below shows her progress over time. Is the relationships between miles driven and time proportional?
______________________
| | | | |
| Hours | 4 | 6 | 8 |
|______|_____|____|____|
| | | | |
| Miles | 240 | 360 | 520 |
|______|_____|____|____|
No, the rate is not constant.