If Line k in the xy-plane has equation y = mx + b, where m and b are constants, what is the slope of k?
(1) k is parallel to the line with equation y = (1-m)x + b +1.
(2) k intersects the line with equation y = 2x + 3 at the point (2, 7).
stmt 1: m = (1-m) [Slopes of parallel lines are equal]
=> 2m = 1; m = 1/2. Sufficient.
stmt 2: Insufficient.