5x+ 6y=-9 [A1] -7x=21 [B1] x= -3 [C1] -4x - 2y=10 [A2] -4x -2y=10 [B2] -4x-2y=10 [C2] Answer the questions below. For each, choose the transformation and then fill in the blank with the correct number. The arrow (- ) means the expression on the left becomes the expression on the right. (a) How do we transform System A into System B? OI x Equation [A1] - Equation [B1] X O x Equation [A2] - Equation [B2] O x Equation [A1] + Equation [A2] - Equation [B2] x Equation [A2] + Equation [A1] - Equation [B1] (b) How do we transform System B into System C? x Equation [B1] - Equation [C1] x Equation [B2] - Equation [C2] x Equation [B1] + Equation [B2] - Equation [C2] x Equation [B2] + Equation [B1] - Equation [C1]