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Which could be the resulting equation when elimination is used to solve the given system of equations?

[tex]
\[
\begin{cases}
5a + 5b = 25 \\
-5a + 5b = 35
\end{cases}
\]
[/tex]

A. [tex]10a = 60[/tex]

B. [tex]10b = 60[/tex]

C. [tex]-10a = 60[/tex]

D. [tex]-10b = 60[/tex]

Answer :

To solve the given system of equations using elimination, let's look at each equation:

1) [tex]\(5a + 5b = 25\)[/tex]

2) [tex]\(-5a + 5b = 35\)[/tex]

The goal is to eliminate one of the variables by adding or subtracting the equations. Here, we can add both equations together to eliminate the variable [tex]\(a\)[/tex]. Here's how it works step-by-step:

1. Add the equations:

- [tex]\( (5a + 5b) + (-5a + 5b) = 25 + 35 \)[/tex]

2. Simplify the left side:

- The [tex]\(5a\)[/tex] and [tex]\(-5a\)[/tex] cancel each other out, so you're left with:

[tex]\((5b + 5b)\)[/tex]

3. Simplify further:

- Combine the terms with [tex]\(b\)[/tex]:

[tex]\(10b = 60\)[/tex]

So, the resulting equation from using elimination is:

[tex]\[10b = 60\][/tex]

This equation allows you to easily solve for [tex]\(b\)[/tex], if needed, but the question here is only about the resulting equation.

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