[4 -1 4] 3. Find the cofactor matrix of M=1 2 1 1 2 2 [6 marks] 4. Consider the linear system X,+...

[4 -1 4] 3. Find the cofactor matrix of M=1 2 1 1 2 2 [6 marks] 4. Consider the linear system X,+ X2 - X3 =p x - xâ‚‚ + 2xâ‚‚ = 9 3x + x2 = 1 in which the numbers p.q and rare scalars. Find the values of p. and rif this system has no solution [6 marks] 5. Show that the following system is consistent, then determine the type of solution a+b+2c=4 2a + 4b-3c6 3a +6b-50=3 [6 marks]