Line K passes through point (n,-1). Is slope of K positive?
1). K passes through the origin point.
2). K passes through (1, n+2)
OA-C
Coord - slopes
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Line K passes through point (n,-1). Is slope of K positive?
1). K passes through the origin point.
slope = 0- (-1)/ 0-n = -1/n can be +ve or -ve based upon n
INSUFF
2). K passes through (1, n+2)
again slope = n+3/1-n can be +ve or -ve INSUFF
Combine
n+3/1-n = -1/n
n^2 +3n =-1 +n
i.e n^2 +2n +1 =0
i.e (n+1)^2 =0
n=-1
so slopw =-1/n =1/2 yes +ve
SUFF
C
1). K passes through the origin point.
slope = 0- (-1)/ 0-n = -1/n can be +ve or -ve based upon n
INSUFF
2). K passes through (1, n+2)
again slope = n+3/1-n can be +ve or -ve INSUFF
Combine
n+3/1-n = -1/n
n^2 +3n =-1 +n
i.e n^2 +2n +1 =0
i.e (n+1)^2 =0
n=-1
so slopw =-1/n =1/2 yes +ve
SUFF
C
Regards
Samir
Samir
Thanks a lot...!!samirpandeyit62 wrote:Line K passes through point (n,-1). Is slope of K positive?
1). K passes through the origin point.
slope = 0- (-1)/ 0-n = -1/n can be +ve or -ve based upon n
................
n=-1
so slope =-1/n =1/2 yes +ve
SUFF
C
A minor slip-up though...
slope=1 +ve... [-1/-1]
if this was a PS and asked to calculate slope - you would have extracted defeat from the jaws of victory;)....for lack of a better analogy!!
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- Master | Next Rank: 500 Posts
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Hey Arocks,
If this was a PS question, I'm sure 1/2 would not have been amongst the answer choices
If this was a PS question, I'm sure 1/2 would not have been amongst the answer choices
Regards
Samir
Samir