Determine which relation is a function.
a.
{(–4, 3), (–2, 3), (–1, 2), (2, 5), (3, 2)}
b.
{(–4, 1), (–2, 3), (–2, 1), (–1, 5), (3, 2)}
c.
{(–4, 1), (–2, 3), (–1, 2), (3, 5), (3, 2)}
d.
{(–4, 1), (–2, 3), (–1, 1), (–1, 5), (3, 2)}

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap