Consider the following three systems of linear equations. System A System B System C 7x+3y=15 [A1] x - 12y=27 [B1] x-12y=27 [C1] -2x - 5y=4 [A2] -2x -5y=4 [B2] -29y=58 [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. How do we transform System A into System B? O x Equation [A1] - Equation [B1] X 5 ? O x Equation [A2] - Equation [B2] O x Equation [A1] + Equation [A2] - Equation [B2] O x Equation [A2] + Equation [A1] - Equation [B1] How do we transform System B into System C? O x Equation [B1] - Equation [C1] O x Equation [B2] - Equation [C2] O x Equation [B1] + Equation [B2] - Equation [C2] O x Equation [B2] + Equation [B1] - Equation [C1]