Answer:
The equation you would use for this problem is: $9.70/5=Px11.
Step-by-step:
We know that 5 rubber stamps costs $9.70, so we need to find out how much just 1 eraser will cost. So we will do $9.70 divided by 5... once you figure out what $9.70/5 is you are going to take that number and multiply it by 11 to get the total cost of 11 erasers.