Book Maths Puzzle Algebra

i need help on how to solve each system. could you please explain it step by step?

first problem:
3x-7y=-5
4x+y=14

second problem:
2x+5y=10
6x+15y=25

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Book Other Question

1.A dog is tied to the corner of a house. His leash is 30 feet long. Over how much area can the dog roam?

2. A bag contains 5 red, 5 white, 5 blue, and 5 green marbles. Two marb sketch the graph of the equation. Label the vertex
20.{{{y=-x^2+2x-1}}}