Solve for y then plug in (-12) for x. Show work please. x = 24 + xy
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Answer is in the attachment below.
To make this as easy as possible, we will find the vertex from the equation above. The vertex is sitting at (h, k) of (2, -3). The directrix is the same number of units from the vertex that the focus is. The formula for the focus for an upwards-opening parabola is 
. The "a" in that formula is the 1/4 sitting in front of (y+3). Filling in accordingly, we have 
. Simplifying we get 
. The focus is on the axis of symmetry along with the vertex, and is 1 unit above the vertex. That means that the directrix is 1 unit BELOW the vertex and is a horizontal line. Therefore, the directrix has an equation of y = -4