Help plz i need hel-p im so stuck man im lost

How is working backward similar to solving an equation?

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.

Pls never taught i’m really confused and i rlly need