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3 votes
Find the value of x in x + y = 9 and x - y = 3.

User Lostaman
by
6.4k points

1 Answer

3 votes

Explanation

We are given the following equations:


\begin{gathered} x+y=9\text{ \lparen equation 1\rparen} \\ x-y=3\text{ \lparen equation 2\rparen} \end{gathered}

We are required to determine the value of x.

We can achieve this by using the elimination method as follows:


\begin{gathered} Equation\text{ 1 + Equation 2} \\ x+x+y+(-y)=9+3 \\ 2x+0=12 \\ 2x=12 \\ (2x)/(2)=(12)/(2) \\ x=6 \end{gathered}

Hence, the value of x is:


x=6

User Mhe
by
6.4k points
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