Which of these sets of ordered pairs would define a line with a negative slope? (hint: use the slope formula m = y-y/ x-x to determine slope)

A. ( 5, 5 ) ( 0, 1 )
B. ( 2 ,3 ) ( -4, -1 )
C. ( 3, 6 ) ( 5, 1 )
D. ( 2, 3 ) ( 7, 6 )