Find the ordered pair $(x,y)$ that satisfies the system of equations \begin{align*} x+y&=15,\\ x-y&=3. \end{align*}
I am going to be blundt- this is a pretty simple question. I recommend looking at YouTube or Khan Academy videos on simulataneous linear equations if you are having trouble with this.
Try adding the two equations, solving for x, and plugging your x value back into one of the equations.
Please try and digest my process, or you won't learn anything. Happy trails!
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If you are OP, the first answer by that Guest was most likely a troll. I will reitirate what I said in my answer - this problem is very basic. You didn't even take the time to check if the Guest's answer was right, which means you are literally just here for a shortcut to your homework. I recommend actually attempting the problem before coming here.
If you are still having issues, I have posted some hints to the process of this equation in my answer (#2), hope it helps.