Determine which relation is a function.
a. {(–5, 1), (–5, 0), (–2, 1), (–1, 4), (6, 2)}
b. {(–5, 1), (–2, 0), (–2, 2), (3, 4), (6, 2)}
c. {(–5, 1), (–2, 0), (–1, 1), (2, 4), (6, 3)}
d. {(–5, 3), (–2, 0), (–1, 2), (6, 4), (6, 3)}

Write the pair of fractions as a pair of fractions with a common denominator

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

Write the slope intercept equation for line ab.