Which of the following is a function? A. (1,1),(-1, 1), (2,3).(-2,1))
B. {(1,1),(-1,-1),(-1,3), (2, 2)}
C. (0-1),(0,1),(1,0),(-1,2)
D.{(0,0), (1, 1), (0, -1), (1,-1)

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem