Solve 5x-y=5 and 2y-x^2=11 without using trial improvement

Solve: 3x+y=6 4x-2y=18 show all work !

How to do this , and can some one explain

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.