The vertex of this parabola is at (1,3). which of the following could be its
equation?
(1,3) oc
o a. x=3(y - 3)2+1
o b. = 3(y - 3)2-1
o c. y = 3(x + 1)2-3
d. y = 3(x + 1)2 + 3