I already a seed you when you asked this the first time. The answer is 3.
You multiply both sides by 50 and then you get this
(In the picture)
Answer:
B: swap the order of the equations
(Yes) they have the same solution
Step-by-step explanation:
2 goes into 400, that is

,
However, 2 goes into 400,
200 times.
-7x^2 - 6x^2 + 3x + 5x - 5 + 2
-13x^2 + 8x - 3