The matrix below represents a system of equations. [ 2 -1 1 | 5, ] 1 1 -1 | -2 ] [ 1 0 -3 |-5 ] What is the solution to this system of equations? a. a=1, b=1, c=2 b. a=1.5, b=1, c=2 c. a=2.5, b=3, c=2 d. a=3, b=3, c=2