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Re: Is the slope of the line l equal to -1/5? [#permalink]
Luckisnoexcuse wrote:
Bunuel wrote:
Is the slope of the line l equal to -1/5?

(1) Lines m and n are parallel and sum of their slopes is less than 1/2.
(2) Line l is perpendicular to line m.



(1) Let slope be m and n for respective lines
\(m=n\)
\(m+m<1/2\)
\(m<1/4\)
not sufficient

(2) \(l*m = -1\)
not sufficient

on combining
\(m=-1/l\)
\(-1/l<1/4\)
\(1/l>1/4\)
\(0<l<4\)
Sufficient

Hence C




can u elaborate how come

−1/l<1/4
1/l>1/4


i think 1/L > -1/4
if u are multiplying with -ve on both sides

??
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Re: Is the slope of the line l equal to -1/5? [#permalink]
Ans is C:

1) insufficient as does not tell us about slope of l
2) insufficient no info about m

combining both

m= -1/L
and also m+m < 1/2
m<1/4

ie -1/L < 1/4
therefore L can take values (-infinity, -4) U (0, + infinity)

Clearly L can not take value from -4 to 0 therefore the slope can never be -1/5
Definite NO

answer is C
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Re: Is the slope of the line l equal to -1/5? [#permalink]
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Re: Is the slope of the line l equal to -1/5? [#permalink]
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