Final answer:
The cost of one blueberry pie is $3 and the cost of one pumpkin pie is $7.
Step-by-step explanation:
To find the cost of one blueberry pie and one pumpkin pie, we need to set up a system of equations using the given information. Let's assume that the cost of one blueberry pie is 'x' dollars and the cost of one pumpkin pie is 'y' dollars. From the given information, we can set up the following equations:
Jill: 6x + y = 59
Dan: 7x + 6y = 122
Solving this system of equations using the substitution method or elimination method, we find that x = 3 and y = 7. Therefore, the cost of one blueberry pie is $3 and the cost of one pumpkin pie is $7.