Mathematics

Problem

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 - (A)

-\frac{1}{5}

(B)

-\frac{1}{4}

(C)

-\frac{1}{3}

(D)

-\frac{1}{2}