Answer: 3 + y = 24
Step-by-step explanation: Hello!
If she rode 3 miles one day and y miles the other 6 days of the week, and in total that adds up to 24 miles, that means the equation should be addition.
3 miles + y miles = 24 miles
Monday, other 6 days, total seven days
The equation should be:
3 + y = 24