[tex]\[
\begin{array}{l}
y=\frac{1}{3} x+5 \\
y=2 x
\end{array}
\][/tex]

Consider the given system of equations. If [tex]\((x, y)\)[/tex] is the solution to the system, then what is the value of [tex]\(y+x\)[/tex]?

[tex]\(\square\)[/tex]



Answer :

To solve the given system of equations, we follow these steps:

[tex]\[ \begin{array}{l} 1. \, y = \frac{1}{3} x + 5 \\ 2. \, y = 2x \end{array} \][/tex]

Step 1: Set the two expressions for [tex]\( y \)[/tex] equal to each other, since both equations describe [tex]\( y \)[/tex].

[tex]\[ \frac{1}{3} x + 5 = 2x \][/tex]

Step 2: Solve the resulting equation for [tex]\( x \)[/tex].

First, eliminate the fraction by multiplying every term by 3:

[tex]\[ 3 \left( \frac{1}{3} x \right) + 3 \cdot 5 = 3 \cdot 2x \][/tex]

Simplifying:

[tex]\[ x + 15 = 6x \][/tex]

Next, isolate [tex]\( x \)[/tex] by subtracting [tex]\( x \)[/tex] from both sides:

[tex]\[ 15 = 6x - x \][/tex]

[tex]\[ 15 = 5x \][/tex]

Finally, solve for [tex]\( x \)[/tex] by dividing both sides by 5:

[tex]\[ x = 3 \][/tex]

Step 3: Substitute [tex]\( x = 3 \)[/tex] back into one of the original equations to find [tex]\( y \)[/tex]. Using the second equation [tex]\( y = 2x \)[/tex]:

[tex]\[ y = 2 \cdot 3 \][/tex]

[tex]\[ y = 6 \][/tex]

Step 4: Find the value of [tex]\( x + y \)[/tex].

[tex]\[ x + y = 3 + 6 = 9 \][/tex]

Thus, the value of [tex]\( x + y \)[/tex] is:

[tex]\[ \boxed{9} \][/tex]

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