PointHard

Question

Points A & B are in the first quadrant ; point ′O′ is the origin. If the slope of OA is 1, slope of OB is 7 and OA = OB, then the slope of AB is -

Options

A.-1/5
B.-1/4
C.-1/3
D.-1/2

Solution

     
mOA = 1, mOB = 7
Let mAB = m
AO = OB
⇒    ∠OBA = ∠OAB
    ⇒m = -, 2
but slope of AB is negative  m = -

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