Question

Which relation diagram represents a function?

Answer 1

which one

Answer 2

Z
X
Y
W

Answer 3

There can only be 1 of every x, or input, value.

Answer 4

x is the input and y is the output.
A function will never have 2 or more x values(inputs) the same...they can have 2 or more y values(outputs) the same, just not the x's.
So what do you think ?

Answer 5

Y?

Answer 6

Y has all 4 arrows going out from 1, so it can't be Y

Answer 7

No......x is the input...and for Y, x is the same, it is 1, and you have 4 ones.....
you cannot have repeating x's (inputs)

Answer 8

thanks you both fanning