Question

What is the solution to the system of equations?

Answer 1

$\begin{cases}3x + y = 3 \\2x + y = 7 \end{cases} \\ \Leftrightarrow \begin{cases}x = - 4 \\2( - 4) + y = 7 \end{cases} \\ \Leftrightarrow \begin{cases}x = - 4 \\ y = 15\end{cases} \\ \Rightarrow (x,y)=(-4,15)$