What does the equation become when one variable is eliminated from the system of equations below?

[tex]\[
\begin{array}{l}
2x + 3y = 7 \\
3x - 3y = 3
\end{array}
\][/tex]

A. [tex]\(9x = 10\)[/tex]

B. [tex]\(5x = 10\)[/tex]

C. [tex]\(3x = -10\)[/tex]

D. [tex]\(-5x = 10\)[/tex]



Answer :

Let's solve the given system of equations step-by-step to eliminate one of the variables and see what the resulting equation becomes.

We are given the following system of equations:

[tex]\[ \begin{array}{l} 2x + 3y = 7 \quad \text{(Equation 1)} \\ 3x - 3y = 3 \quad \text{(Equation 2)} \end{array} \][/tex]

Our objective is to eliminate one of the variables, which in this case is [tex]\( y \)[/tex].

First, we'll add the two equations to eliminate [tex]\( y \)[/tex]:

[tex]\[ (2x + 3y) + (3x - 3y) = 7 + 3 \][/tex]

Simplifying the left-hand side:

[tex]\[ 2x + 3x + 3y - 3y = 7 + 3 \][/tex]

Combine like terms:

[tex]\[ (2x + 3x) + (3y - 3y) = 7 + 3 \][/tex]

Since [tex]\( 3y - 3y = 0 \)[/tex], the equation simplifies to:

[tex]\[ 5x + 0 = 10 \][/tex]

So we end up with the following equation:

[tex]\[ 5x = 10 \][/tex]

It is clear that the correct form of the equation when one variable is eliminated is:

[tex]\[ 5x = 10 \][/tex]

Therefore, the correct answer is:

B. [tex]\( 5x = 10 \)[/tex]