Please help with my last question.

Plzzzz i beg u asap ! what is the equation of this graphed line? enter your answer in slope-intercept form in the box.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)