Vectors and Matrix

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N Write the following linear system in the form of vector equations and matrix equations. DO NOT solve the equations. a) 321 + 212 - 913 = 7 - 12 + 513 = -2 b) 21 - 32 = 3 512 + 204 = -7 21 - 3.3 = -1 12 - 13 + 214 = 4Solve the matrix equations ASE = b and write the solution as a vector. 1 2 4 1 a)A= 0 1 5 ,b: u 3 [) 7 1 2 1 0 3 1 2 a 1 I))A u 5 'b 1 3. A 0 1 JUAN . Consider the matrix A = 0 2 9 (i) Can every vector in R be written as a linear combination of the columns of A? (ii) Do the columns of A span R4? (iv) Does the equation Ax = b have a solution for every b in R4