Identify the relation that is also a function.
:A. {(0, -1) (1, -2) (2, -3) (-1, 2)}
B. {(1, 0) (2, 3) (3, -1) (1, 5)}
C. {(4, 2) (4, -3) (9, 3) (9, -3)}
D. {(5, 4) (5, 1) (5, 3) (0, 5)}

Question

Identify the relation that is also a function. 
:A. {(0, -1) (1, -2) (2, -3) (-1, 2)}
B. {(1, 0) (2, 3) (3, -1) (1, 5)}
C. {(4, 2) (4, -3) (9, 3) (9, -3)}
D. {(5, 4) (5, 1) (5, 3) (0, 5)}

jim_thompson5910 · Answer

a relation is a function if each x value is paired with exactly one y value

so something like {(1,2), (3,4), (1,7)} is not a function since x = 1 is paired with y = 2 and y = 7 at the same time

anonymous · Answer

so its c

jim_thompson5910 · Answer

you sure? notice how we have (4,2) and (4,-3)

anonymous · Answer

its b :)

jim_thompson5910 · Answer

(1,0) and (1,5)....so no

jim_thompson5910 · Answer

if you plug in some number for x, it must produce EXACTLY ONE output y

anonymous · Answer

o soo A

hero · Answer

@lol54arino, are you guessing?

anonymous · Answer

yeahhhh

anonymous · Answer

ughh its nun of then cuz they all have the same numbers

jim_thompson5910 · Answer

For each answer choice, plot all the points

any of them that fail the vertical line test is not a function

anonymous · Answer

just check if (x, y) pairs are such that for same x coordinate you do not have two different y coordinates

anonymous · Answer

you can visit this web page to understand the basis...... http://www.mathsisfun.com/sets/function.html