In the xy-plane, what is the slope of line l?
(1) Line l dose not intersect the line with equation y = 1 - x.
(2) Line l intersects the line with equation y = x - 1.
graph
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(1) If it does not intresect then they are parallel line having the same slope. Sufficient.
(2) If they intersect at 90° then the product of the slope is -1. This is not necessary. Insufficient.
IMO A
(2) If they intersect at 90° then the product of the slope is -1. This is not necessary. Insufficient.
IMO A