Given the system of equations:
[tex]\begin{cases}x+3y=-1\ldots(1) \\ y=-\frac{1}{3}x-\frac{1}{3}\ldots(2)\end{cases}[/tex]Using (2) in (1):
[tex]\begin{gathered} x+3(-\frac{1}{3}x-\frac{1}{3})=-1 \\ x-x-1=-1 \\ -1=-1 \end{gathered}[/tex]There are infinite solutions.
