1. For each of the following system of equations, determine how many solutions there are, and if there is a unique solution, find it using row operations. (a) (b) (c) (d) (b) 2x-3y = 9 -x+ 5y = 13 (c) x-2y+32 = 21 -2x + 5y +z = 15 x+2y-z = -7 x+7y-2z = x - 2y + 5z = 5x + 8y +11z = 2x+8y2z = 10 x+y+ 2z = 11 -3x+y-z = 4 2. Solve each of the following systems of equations using the matrix inverse method. (a) 4x + y = 1 2xy = 11 1 -2