-x+7y=3
-5x+35y=15
You asked:
Solve the system of equations:\[\begin{aligned}-x + 7 y &= 3\\-\left( 5 x \right) + 35 y &= 15\end{aligned}\]
MathBot Answer:
The system of equations has infinitely many solutions.
$$\begin{aligned}x &= 7 y - 3\end{aligned}$$
\(y\) is a free variable.