You come across the following system of equations, in which one of the coefficients is illegible (here represented by a question mark.

3x + 10y + 16z = −5
2x + 7y + 11z = ? x + 3y + 5z = −1

(a) For which values of ? does there exist a solution? using matrix operations or anything with linear system equations more preferably guass jordan elimnation method for both parts??
(b) In this case (or cases), find all solutions.