Answer:
1. How do we transform System A into System B
Answer is First choice with -3 filled in box
-3 x Equation [A1] ⇒ Equation [B1] (first choice; fill in -3)
2. How do we transform System B into System A
answer is the Last choice with 5 filled in the box
5 x Equation [B2] + Equation [B1] => Equation [C1]
In the last choice fill in 5 in the box
Explanation:
-3 x [A1] => -3 (-9x - 5y = -2)
=> - 3(-9x) -3(-5y) = 3(-2)
=> 27x + 15y = 6 which is B1
5 x [B2]
=> 5(-4x - 3y) = 5(3)
=> -20x -15y = 15
5 x [B2] + B1
=>
-20x -15y = 15
+
27x + 15y = 6
----------------------
7x + 0 = 21
or 7x = 21 which is C1