Consider the quadratic equation $\displaystyle {y}={x}^{{2}}-{x}-{12}$.

Determine the following: (enter all numerical answers as integers, fractions, or decimals):

The $\displaystyle {x}$-intercepts are  .  Give your answers as points, separated by a comma.
The $\displaystyle {y}$-intercept is  .  Give your answer as a point.
The vertex is  .
The line of symmetry has the equation .