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A system of equations and its solution are given below.

System A
x - y = 7
-3x + 9y = -39
Solution:(4,-3)

Complete the sentences to explain what steps were followed to obtain the system of equations below.

System B
x-y=7
6y = -18
To get system B, the (first, second) equation in system A was replaced by the sum of that equation and (9, 3, -9, -3) times the (second, first) equation. The solution to system B (is, is not) the same as the solution to system A.