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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 :

Sure! Let's solve the system of equations using the elimination method step by step.

We are given the system of equations:
1. [tex]\(5a + 5b = 25\)[/tex]
2. [tex]\(-5a + 5b = 35\)[/tex]

The goal of the elimination method is to eliminate one of the variables by adding or subtracting the equations. Let's try eliminating the variable [tex]\(a\)[/tex].

### Step-by-step Solution:

1. Add the Equations:

We will add the two given equations together:

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

2. Simplify the Expression:

When we add them, the [tex]\(5a\)[/tex] and [tex]\(-5a\)[/tex] terms will cancel each other out because they are equal but opposite in sign.

So, the equation simplifies to:

[tex]\[
0a + 10b = 60
\][/tex]

3. Resulting Equation:

This reduces to:

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

From this process, we can see that the resulting equation when using elimination to solve the given system is [tex]\(10b = 60\)[/tex]. That's the equation obtained after eliminating the variable [tex]\(a\)[/tex].

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