Answer:
The slope is how much he saves per week (In this case it would be $5 per week)
Step-by-step explanation:
Slope is rise/run or change in y/change in x
In this graph, from x=0 to x=8, the rise or change in y is 40$ and the run or change in x is 8 weeks. So the slope is $40/8 weeks, or $5/week
