Which of the following sets of ordered pairs are not a function? A.(2,1), (3,4), (5,6), (2,7)

B.(3,1), (−3,1), (0,0), (5,1)

C.(1,1), (2,2), (3,3), (4,4)

D.(4,1), (6,7), (8,9), (4,7)

(2,4), (2,5), (2,6), (2,8)

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?