No, John is not correct (there are many values of x and y that could work)
Here, we want to get if John is correct
Looking at the two equations given, we can see that the two equations are the same
If we divided the second equation by 2, we will get the first equation
Literally, this means we have the same equation in the system of linear equations
This means that the given system cannot be solved simply because we have a repetition of the same equation.
Thus, the system of equations cannot be solved as there are infinitely many solutions that can work for x and y