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A system of equations and its solution are given below.

System A:
[tex]\[
\begin{array}{c}
5x - y = -11 \\
3x - 2y = -8 \\
\text{Solution: }(-2, 1)
\end{array}
\][/tex]

To get system B below, the second equation in system A was replaced by the sum of that equation and the first equation in system A multiplied by -2.

System B:
[tex]\[
5x - y = -11
\][/tex]

A. The second equation in system B is [tex]\(-7x = 14\)[/tex]. The solution to system B will be the same as the solution to system A.

B. The second equation in system B is [tex]\(7x = 30\)[/tex]. The solution to system B will be the same as the solution to system A.

C. The second equation in system B is [tex]\(-7x = 14\)[/tex]. The solution to system B will not be the same as the solution to system A.

D. The second equation in system B is [tex]\(7x = 30\)[/tex]. The solution to system B will not be the same as the solution to system A.

Sagot :

GinnyAnswer
To solve this problem, we need to go through the following steps:

1. Identify System A:
[tex]\[ \begin{cases} 5x - y = -11 \\ 3x - 2y = -8 \\ \end{cases} \][/tex]
The given solution for this system is [tex]\( (-2, 1) \)[/tex].

2. Transform the second equation for System B:

The process described involves replacing the second equation of System A with a new equation. This new equation is obtained by adding the second equation of System A to the first equation of System A multiplied by -2.

Multiply the first equation [tex]\(5x - y = -11\)[/tex] by -2:
[tex]\[ -2(5x - y) = -2(-11) \][/tex]
Simplifying, we get:
[tex]\[ -10x + 2y = 22 \][/tex]

Now, add this result to the second equation of System A [tex]\(3x - 2y = -8\)[/tex]:
[tex]\[ (3x - 2y) + (-10x + 2y) = -8 + 22 \][/tex]
Simplifying the left-hand side and the right-hand side:
[tex]\[ 3x - 10x + 2y - 2y = 14 \][/tex]
[tex]\[ -7x = 14 \][/tex]

3. Construct System B:

Based on the above transformation, the second equation of System B is:
[tex]\[ -7x = 14 \][/tex]

So, System B is:
[tex]\[ \begin{cases} 5x - y = -11 \\ -7x = 14 \\ \end{cases} \][/tex]

4. Check the Correctness of the Answers:

- Option A: The second equation in System B is [tex]\( -7x = 14 \)[/tex]. The solution to System B will be the same as the solution to System A.
- Option B: The second equation in System B is [tex]\( 7x = 30 \)[/tex]. The solution to System B will be the same as the solution to System A.
- Option C: The second equation in System B is [tex]\( -7x = 14 \)[/tex]. The solution to System B will not be the same as the solution to System A.
- Option D: The second equation in System B is [tex]\( 7x = 30 \)[/tex]. The solution to System B will not be the same as the solution to System A.

Since the second equation we derived for System B is [tex]\( -7x = 14 \)[/tex] and given the solution to System A is [tex]\((-2, 1)\)[/tex], we solve for [tex]\(x\)[/tex] from [tex]\(-7x = 14\)[/tex]:
[tex]\[ x = 14 / -7 \implies x = -2 \][/tex]
Substituting [tex]\(x = -2\)[/tex] back in, we retain consistency with System A's solution.

Hence, the correct answer is:

A. The second equation in system [tex]\(B\)[/tex] is [tex]\(-7x = 14\)[/tex]. The solution to system [tex]\(B\)[/tex] will be the same as the solution to system [tex]\(A\)[/tex].
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