Question 13 An equation of the form y = 4px is given. Write equations for the directrix and axis of symmetry. Not yet answered 12 = -7x Points out of 6.25 Select one: Flag 7 O a. directrix: x = - -; axis of symmetry: y = 0 question 4 7 O b. directrix: x = -; axis of symmetry: x = 0 4 7 O c. directrix: x = 4 -; axis of symmetry: y = 0 O d. directrix: x = - -; axis of symmetry: x = 0 4