How do I transform system A into system B and then system B into system C

System A System B System c -8x+9y =-13 [A1] 7x -- 28 [B1] x - 4 [01] -5x+3y =5 [A2] -5x + 3y - 5 [B2] -5x + 3y - 5 [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 O x Equation [A2] - Equation [B2] O x Equation [A1] + Equation [A2] - Equation [B2] O x Equation [A2] + Equation [A1] - Equation [81]