I need solve this questions

Question 1 (20 points); For the given matrix 2 2 W A=01-27 0 5 a) [5 pts] if determinant of value is 2, then find the value of f. b) [15 pts] find the inverse of the matrix after you calculated t. Question 2 (20 points); Let W be the set of all the vectors of the form where x. y > 0. a) [8 points] Is W closed under addition ? Prove or give a counter example. b) [12 points] Is W closed under scalar multiplication ? Prove or give a counter example. Can we conclude W is a subspace of R2 ? Explain your