The table below shows the cost for a gym membership at the local fitness center with an initial start-up fee charged in the first month. Find the slope, or monthly cost.
| Month | Cost |
|---------|------|
| 1 | $70 |
| 2 | $50 |
| 3 | $40 |
| 4 | $30 |
| 5 | $20 |
| 6 | $20 |
| 7 | $20 |
| 8 | $20 |
| 9 | $20 |
| 10 | $20 |
To find the slope, we can calculate the change in cost over the change in month.
Slope = (Change in Cost) / (Change in Month)
Slope = ($50 - $70) / (2 - 1) = -$20
So, the monthly cost for the gym membership is $20 decrease per month.