Coord - slopes

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

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

Thanks a lot...!!
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!!

Hey Arocks,
If this was a PS question, I'm sure 1/2 would not have been amongst the answer choices

Absolutely...the other way to look at any slip-ups is that they would happen only to the experimental questions, so won't be marked!!

But you give great explanations...i was just trying to be a pain;)