Explanation
This question is asking us whether Point Q is equidistant
from these other two points. If it is, then, possibly it lies on the middle
point of the line segment connecting those two points. That line segment would
lie along the horizontal line
and it would
have an x-value equidistant between 4
and -2, which would be 1. (You can find both values by calculating the average
of the coordinates.) But this isn't the only point that is equidistant. You
could convince yourself visually or by trying case of the distance formula /
Pythagorean Theorem that any point that lies on the vertical line
will be
equidistant to the other two points. If the point is on that line, then the
answer to the question will be definitively "yes." Let's move to the data
statements, evaluating them separately first.
Statement (1) gives us what we just said: this is the
exact condition for equidistance. Sufficient.
Statement (2) would allow the first case that we thought
of, the point at (1, 4), but it doesn't tell us the x coordinate, so all we have is (x, 4). The point could be
equidistant from the other two or it could be quite close to one of the points,
for example. Statement (2) therefore does not give us data sufficient to answer
the question definitively in the positive or the negative.
The correct answer is (A).
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