Plz do a and b ONLY!!

Thx for your help.

Give a vector, if one exists, that generates the null space of the ...... See Below.

5. Give a vector, if one exists, that generates the null space of the follow- ing systems of equations or matrices. Which of these seven sys- tems/ matrices are invertible? [Consider the coefcient matrix and ig- nore the particular right-side values in parts (e) and (f).] l 2 4 -1 2 (a) 2 4 (b) 2 5 1 2 3 -1 1 3 l 2 1 1 (c) 5 1 3 (d) 1 2 -3 2 1 2. 3 4 '5 (e) x_2y+z=6 (f) xy+z=3 -x+y-22=4 x+y+z=3 ll q 2x-3y+z