Answer:
[tex]\Large \boxed{\mathrm{E}}[/tex]
Step-by-step explanation:
The x-intercept is when y = 0.
[tex]y = 3x + 1[/tex]
Let y = 0.
[tex]0=3x+1[/tex]
Subtracting 1 from both sides.
[tex]-1=3x[/tex]
Dividing both sides by 3.
[tex]\frac{-1}{3} =x[/tex]
The x-intercept is negative.
