Answer: x = 0
Explanation:
Let's start with what we know:
We know that the line passes through (0,4) and (0,-3). Hmm, this is tricky but we can see that x = 0 for both points which would mean that this line is vertical. Because y changes, but x doesn't change, we know that x = 0 for the whole time.
So the answer is x = 0.