Select the correct answer from each drop-down menu. A system of equations and Its solution are glven 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
y=7
To get system B, the IM equation in system A was replaced by the sum of that equation and
equation. The solution to system B Mthe same as the solution to system A.
times the

C. To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by -3. The solution to system B will be the same as the solution to system A.

Step-by-step explanation:

System A

x + 6y = 5

3x - 7y = -35

Solution: (-7, 2)

System B  

x + 6y = 5

-25y = -50

First equation is same in both system A  and B

To get system B, the second equation in system A was replaced by sum of that equation and first equation multiplied by -3

x + 6y = 5  (Multiply by -3)

-3x -18y =-15

now do the sum of 3x - 7y = -35  and -3x -18y =-15

3x - 7y = -35  

-3x -18y =-15

yes

step-by-step explanation:

true

step-by-step explanation: