x+3y-4=0
3x+9y=12
You asked:
Solve the system of equations:\[\begin{aligned}x + 3 y - 4 &= 0\\3 x + 9 y &= 12\end{aligned}\]
MathBot Answer:
The system of equations has infinitely many solutions.
$$\begin{aligned}x &= 4 - 3 y\end{aligned}$$
\(y\) is a free variable.