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Point A and B are in the first quadrant;...

Point `A` and `B` are in the first quadrant; point `O` is the origin. If the slope of `O A` is 1, the slope of OB is 7, and `O A=O B ,` then the slope of `A B` is `-1/5` (b) `-1/4` (c) `-1/3` (d) `-1/2`

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