V /stem A System B System C 7x- 8y=-15 [A1] x+ 2y= -21 [B1] x+ 2y=-21 [C1] 3x - 5y=3 [A2] 3x - 5y=3 [B2] -1ly=66 [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? OO * Equation [A1] - Equation [B1] X * Equation [A2] - Equation [B2] x Equation [A1] + Equation [A2] - Equation [B2] * 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] n