Nicholas and Leonardo had been trying to solve a system of three equations in four unknowns, which they had written in matrix form as Ax = b. Nicholas reduced A to a row echelon form matrix U, but accidentally blurred out some of their work with blue cordial, leaving four of the entries unreadable. The row echelon form matrix now looks like (2 m n p U -0 0 6 q 0 0 0 0/ (a) Given only this information, solect all options that give a possiblo geometrical description of the solutions of the systom of aquations. O the empty set O a point a line a plane all of R (b) Leonardo remermbers that three specific solutions for the system are and Nicholas says. "That's great That means we can write a general solution to the system of equations in the form or perhaps as for some vectors a, v,, va c R' and real parameters t, and tg. Hmmmm, Im not sure which, maybe we need even more vectors and paramelers. Can you help me? Find a parametric vector form of the solution to the system of equations Ax = b given the three specific solutions above and enter it in the box below the syntax advice