High School

Which system of equations is equivalent to this system?

[tex]
\[
\begin{aligned}
6r + 4s &= 2r + 0 \\
2(r + 5s) &= 2s + 0 \\
\end{aligned}
\]
[/tex]

A.
[tex]
\[
\begin{aligned}
8r + 4s &= 8 \\
8s &= 0 \\
\end{aligned}
\]
[/tex]

B.
[tex]
\[
\begin{aligned}
2r + 4s &= 8 \\
8s &= 0 \\
\end{aligned}
\]
[/tex]

C.
[tex]
\[
\begin{aligned}
4r + 4s &= 8 \\
8s &= 0 \\
\end{aligned}
\]
[/tex]

D.
[tex]
\[
\begin{aligned}
-4r + 4s &= 8 \\
8s &= 0 \\
\end{aligned}
\]
[/tex]

Answer :

Sure! Let's work through the given system of equations step by step to find the equivalent system.

The original system is:
[tex]\[
\begin{aligned}
6r + 4s & = 8 \\
2(r + 5s) & = 2s
\end{aligned}
\][/tex]

First, we'll simplify the second equation. Expand and simplify it:
[tex]\[
2(r + 5s) = 2s \\
2r + 10s = 2s
\][/tex]
Subtract [tex]\(2s\)[/tex] from both sides:
[tex]\[
2r + 8s = 0
\][/tex]

Now we have the simplified system:
[tex]\[
\begin{aligned}
6r + 4s & = 8 \\
2r + 8s & = 0
\end{aligned}
\][/tex]

Next, we need to rewrite [tex]\(6r + 4s = 8\)[/tex] and [tex]\(2r + 8s = 0\)[/tex] in an equivalent form. We know from the problem description that we are looking for systems in a specific answer format.

Let's look at the possible choices and check which system matches our simplified system:

1. [tex]\[
\begin{aligned}
8r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]
2. [tex]\[
\begin{aligned}
2r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]
3. [tex]\[
\begin{aligned}
4r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]
4. [tex]\[
\begin{aligned}
-4r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]

We can see that only the third choice conforms to the structure derived from the original system while accounting for the transformations needed to simplify:
1. [tex]\( 6r + 4s = 8 \implies 4(r + s) = 8 \implies 4r + 4s = 8 \)[/tex]
2. [tex]\( 2r + 8s = 0 \text{ already translates directly to } 8s = 0\)[/tex]

Thus, the equivalent system is:
[tex]\[
\begin{aligned}
4r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]

Therefore, the correct answer is indeed:
[tex]\[
\begin{aligned}
4r + 4s & = 8 \\
8s & = 0
\end{aligned}
\][/tex]