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
1). K passes through the origin point.
2). K passes through (1, n+2)
OA-C
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
