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21 Nov 2019, 01:35
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
58% (01:46) correct
42%
(01:27)
wrong
based on 79
sessions
History
Date
Time
Result
Not Attempted Yet
In the XY-coordinate plane, is the product of slopes of line L and line K negative?
(1) The product of the x-intercepts of line L and K is positive.
(2) The product of the y-intercepts of line L and k is negative.
(1) The product of the x-intercepts of line L and K is positive.
(2) The product of the y-intercepts of line L and k is negative.
21 Nov 2019, 03:35
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Raxit85
Explanation:
gmatbull Thanks, I still remember your answer for this type of question.
Follow Attachments:
Let M1 and M2 represent the gradients of lines K and L
(1)
from sketch (i), M1*M2 < 0
from sketch (ii), M1*M2 > 0
INSUFFICIENT
(2)
from sketch (i), M1*M2 < 0
from sketch (iii), M1*M2 > 0
INSUFFICIENT
Combining (1) and (2):
ONLY sketch i) satisfies --> SUFFICIENCY
option C is therefore correct
Pls provide kudos, if you find my explanation good enough Attachments
intersecting lines K and L.docx [11.19 KiB]
Downloaded 126 times
18 Sep 2021, 07:51
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Raxit85
Statement 1:
The slope of lines L and K could be anything. Insufficient.
Statement 2:
The slope of lines L and K could be anything. Insufficient.
Combined:
If we have two positive x-intercepts, lines L and K will have 1 positive slope and 1 negative slope.
If we have two negative x-intercepts, lines L and K will still have 1 positive slope and 1 negative slope.
Either way, the product of slopes is negative. Sufficient.
Ans: C
