1. Which relation is not a function? Explain. 1) {(1,5),(2,6),(3,6),(4,7)} 2) {(4.7).(2,1),(-3,6),(3,4)}
3) ((-1,6),(1,3),(2,5),(1,7)} 4){(-1,2),(0,5),(5,0),(2,-1)}
7 Which function is not one-to-one? Fynlain

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2