What is the x-intercept of y = 3x - 4?

The $x$-intercept is when $y = 0$
$0 = 3 x - 4 \to$ add 4 on both sides:
$4 = 3 x \to x = \frac{4}{3} = 1 \frac{1}{3}$
So the $x$-intercept is $\left(1 \frac{1}{3} , 0\right)$