Mathematics

The substitution method works by isolating one variable in one equation, then plugging that expression into the other equation to eliminate it. Here, the first equation has $y$ with a coefficient of 1, making it the easiest to isolate—solve for $y$ in terms of $x$, then substitute that expression into the second equation to find $x$. Once you have $x$, back-substitute to find $y$, and check both values in the original equations.

The substitution method works by isolating one variable in one equation, then plugging that expression into the other equation to eliminate it. Here, the first equation has $y$ with a coefficient of 1, making it the easiest to isolate—solve for $y$ in terms of $x$, then substitute that expression into the second equation to find $x$. Once you have $x$, back-substitute to find $y$, and check both values in the original equations.