GMAT Math : DSQ: Calculating the endpoints of a line segment
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Example Question #1 : Dsq: Calculating The Endpoints Of A Line Segment
Consider segment 
I) Point 
II) Segment 
What are the coordinates of point 
Statement II is sufficient to answer the question, but statement I is not sufficient to answer the question.
Either statement alone is sufficient to answer the question.
Neither I nor II are sufficient to answer the question. More information is needed.
Both statements are necessary to answer the question.
Statement I is sufficient to answer the question, but statement II is not sufficient to answer the question.
Statement I is sufficient to answer the question, but statement II is not sufficient to answer the question.
In this case, we are given the midpoint of a line and asked to find one endpoint.
Statement I gives us the other endpoint. We can use this with midpoint formula (see below) to find our other point.
Midpoint formula:
Statment II gives us the length of the line. However, we know nothing about its orientation or slope. Without some clue as to the steepness of the line, we cannot find the coordinates of its endpoints. You might think we can pull of something with distance formula, but there are going to be two unknowns and one equation, so we are out of luck.
So,
Statement I is sufficient to answer the question, but statement II is not sufficient to answer the question.
Example Question #2 : Dsq: Calculating The Endpoints Of A Line Segment
Find endpoint 
I) Segment 
II) Point 
Statement II is sufficient to answer the question, but statement I is not sufficient to answer the question.
Statement I is sufficient to answer the question, but statement II is not sufficient to answer the question.
Neither statement is sufficient to answer the question. More information is needed.
Both statements are needed to answer the question.
Either statement is sufficient to answer the question.
Both statements are needed to answer the question.
Find endpoint Y given the following:
I) Segment RY has its midpoint at (45,65)
II) Point R is located on the x-axis, 13 points from the origin.
I) Gives us the location of the midpoint of our segment
(45,65)
II) Gives us the location of one endpoint
(13,0)
Use I) and II) to work backwards with midpoint formula to find the other endpoint.
So endpoint 
Therefore, both statements are needed to answer the question.
Example Question #3 : Dsq: Calculating The Endpoints Of A Line Segment
Consider segment
I) Endpoint 
II) 
Where is endpoint 
Statement II is sufficient to answer the question, but Statement I is not sufficient to answer the question.
Either statement is sufficient to answer the question.
Both statements are needed to answer the question.
Neither statement is sufficient to answer the question. More information is needed.
Statement I is sufficient to answer the question, but Statement II is not sufficient to answer the question.
Neither statement is sufficient to answer the question. More information is needed.
To find the endpoint of a segment, we can generally use the midpoint formula; however, in this case we do not have enough information.
I) Gives us one endpoint
II) Gives us the length of DF
The problem is that we don't know the orientation of DF. It could go in infinitely many directions, so we can't find the location of 
Example Question #4 : Dsq: Calculating The Endpoints Of A Line Segment
(1) Point Q is the origin.
(2) Line PQ is 8 units long.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
EACH statement ALONE is sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
The midpoint formula is
with statement 1, we know that Q is 
Statement 1 alone is sufficient.
Statement 2 doesn't provide enough information to solve for point P.
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