Could you help me solve the exercises in the photograph? They are number 20 - 21 - 22. I write here the translation of the delivery: 20) Among the following systems in the unknowns x and y indicate those of first degree

21) Indicate the degree of each of the following systems.

22) Complete the following systems by writing an equation in the unknowns x and y in such a way that the system formed by the two equations has the degree indicated on the side.
- The first system must be of the second degree
- The second system must be of the first degree.

Thank you and happy New Year!