Which of the following systems of equations has the solution [tex]$(-1,5)$[/tex]?

A.
[tex]\[
\begin{array}{l}
y = 3x + 8 \\
y = -x + 4
\end{array}
\][/tex]

B.
[tex]\[
\begin{array}{l}
y = 3x + 8 \\
y = -x - 4
\end{array}
\][/tex]

C.
[tex]\[
\begin{array}{l}
y = 3x - 8 \\
y = -x + 4
\end{array}
\][/tex]

D.
[tex]\[
\begin{array}{l}
y = 3x - 8 \\
y = -x - 4
\end{array}
\][/tex]



Answer :

To determine which system of equations has the solution [tex]\((-1, 5)\)[/tex], we need to check each system and substitute [tex]\(x = -1\)[/tex] and [tex]\(y = 5\)[/tex] into the equations to see if both equations in a given system are satisfied.

### System 1:
[tex]\[ \begin{cases} y = 3x + 8 \\ y = -x + 4 \end{cases} \][/tex]

1. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = 3x + 8 \)[/tex]:
[tex]\[ y = 3(-1) + 8 = -3 + 8 = 5 \][/tex]

2. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = -x + 4 \)[/tex]:
[tex]\[ y = -(-1) + 4 = 1 + 4 = 5 \][/tex]

Both equations are satisfied, so System 1 has the solution [tex]\((-1, 5)\)[/tex].

### System 2:
[tex]\[ \begin{cases} y = 3x + 8 \\ y = -x - 4 \end{cases} \][/tex]

1. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = 3x + 8 \)[/tex]:
[tex]\[ y = 3(-1) + 8 = -3 + 8 = 5 \][/tex]

2. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = -x - 4 \)[/tex]:
[tex]\[ y = -(-1) - 4 = 1 - 4 = -3 \][/tex]

The second equation is not satisfied, so System 2 does not have the solution [tex]\((-1, 5)\)[/tex].

### System 3:
[tex]\[ \begin{cases} y = 3x - 8 \\ y = -x + 4 \end{cases} \][/tex]

1. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = 3x - 8 \)[/tex]:
[tex]\[ y = 3(-1) - 8 = -3 - 8 = -11 \][/tex]

2. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = -x + 4 \)[/tex]:
[tex]\[ y = -(-1) + 4 = 1 + 4 = 5 \][/tex]

The first equation is not satisfied, so System 3 does not have the solution [tex]\((-1, 5)\)[/tex].

### System 4:
[tex]\[ \begin{cases} y = 3x - 8 \\ y = -x - 4 \end{cases} \][/tex]

1. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = 3x - 8 \)[/tex]:
[tex]\[ y = 3(-1) - 8 = -3 - 8 = -11 \][/tex]

2. Substitute [tex]\(x = -1\)[/tex] into [tex]\( y = -x - 4 \)[/tex]:
[tex]\[ y = -(-1) - 4 = 1 - 4 = -3 \][/tex]

Both equations are not satisfied, so System 4 does not have the solution [tex]\((-1, 5)\)[/tex].

### Conclusion:
The system of equations that has the solution [tex]\((-1, 5)\)[/tex] is:

[tex]\[ \begin{cases} y = 3x + 8 \\ y = -x + 4 \end{cases} \][/tex]

which is System 1.