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{{ printedBook.courseTrack.name }} {{ printedBook.name }} In step $1,$ $y$ was isolated correctly. In step $2,$ the expression from step $1$ was substituted into the second equation and $x$ was solved for correctly. In step $3,$ $y$ was substituted with the value of $x.$ This is the mistake.

To solve it correctly, we should substitute the $x$ with $1$ and calculate the value of $y$. The value of $y$ is $2.$