Question

For each of the ff relations, indicate which relations are also functions.

a. {(2,5),(3,6),(4,7)(5,8)}
b. {(1,1),(2,8),(3,27),(4,64)}
c. {(1,4),(2,4),(3,5),(4,5)}
d. {(0,1),(0,2),(3,3),(3,4)}
e. {(a,6),(b,6),(c,6),(d,6)}
f. {(a,2),(a,4),(a,6),(a,8)}

Answer 1

d is not a function

Answer 2

plot your points, if you can draw a vertical line through them , then it is not a function

Answer 3

fails vertical line test,
so the others in this manner