Question

is the following relation a function?
{(0.3,0.6),(0.4,0.8),(0.3,0.7),(0.5,0.5)}

Answer 1

check if there's any X-REPEATS, in the set of (x,y) ordered pairs
if there's an X-REPEAT, then is NOT a function
if there isn't any, then it's

Answer 2

how do i tell if there is an x repeat?

Answer 3

well... recall that each ordered pair is made up of 2 elements (x, y)
say ( 0.3 , 0.6)
x y

Answer 4

an X-REPEAT would be 2 "x" appearing in the set

Answer 5

thank you for your help(:

Answer 6

yw