knight247 wrote:OA is D
I solved it in this manner... Point F with co-ordinates 2,-1 is the midpoint of two points... i.e.
x1+x2/2=2 or x1+x2=4 and y1+y2/2=-1 or y1+y2=-2. I then checked which answer choices meet this requirement. I narrowed it down to B and D. But am unable to go any further. Hoping to get some detailed explanations. Cheers.
ALWAYS LOOK AT THE ANSWER CHOICES.
Since B and D include the same two coordinate pairs, just in reverse order, the ordering in the answer choices must reflect the ordering in the question: the first coordinate pair in each answer choice is B, the second A.
Since the x coordinate of F is 2, the x coordinate of B must be greater than 2, and the x coordinate of A must be less than 2.
Only answer choice
D works: (6,-3) and (-2,1).
The correct answer is
D.
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