need help in all this question

Let A be the matrix below 6 9 4 A = -10 10 -6 A nonzerovector in 1 (A) (the null space of A) is (Enter the components of a NONZERO vector in the nullspace)Solve the system: 2x - 7y = 25 5x - 2y = 15 rref Answer: (x, y) =1 3 4 10 0 1 A matrix A= 0 0 2 2 reduces to 0 3 0 -4 1 0 -4 5 0 0 2 -2 Find a basis for Nul A:4 4 -4 -4 A matrix A reduces to 0 0 -4 -1 0 0 0 How many vectors are there in the basis of col(A): N(A)