Question

\left. \begin{array} { l } { x = 7 y } \\ { x + y = 32 } \end{array} \right.​

Answer 1

$\large\boxed{\begin{array}{l}\begin{cases}\rm x=7y\\\rm x+y=32\end{cases}\\\\\rm 7y+y=32\\\rm 8y=32\\\rm y=\dfrac{32}{8}\\\\\rm y=4\\\rm x=7y\\\rm x=7\cdot4\\\rm x=28\\\rm S=\{28,4\}\end{array}}$