## kaylalynn Group Title which is a function? one year ago one year ago

1. kaylalynn Group Title

$A. \left[ y \right]$

2. ParthKohli Group Title

The guy which has a unique mapping to it.

3. Speedy_Jazz Group Title

do you have a better example?

4. Dean.Shyy Group Title

This may help: http://is.gd/PItqZG

5. Speedy_Jazz Group Title

That does help Dean,shy

6. kaylalynn Group Title

$A. x=\left[ y \right]$ $B. y= \left| x \right|$ $C. x ^{2} + y ^{2} = 49$ $D. x = y ^{2}$

7. nincompoop Group Title

8. kaylalynn Group Title

which ever one is a function. . .

9. nincompoop Group Title

which do you think IS a function in the choices you've been provided?

10. kaylalynn Group Title

D?

11. nincompoop Group Title

why?

12. kaylalynn Group Title

because it has a y. lol im so sorry. im tired!!

13. nincompoop Group Title

hehehe I don't think you read the attachment that was shared to you. read it a little bit, will you? it will help you answer a lot of problems regarding functions

14. kaylalynn Group Title

C?

15. nincompoop Group Title

okay, you're just obviously guessing. did you read the attachment?

16. kaylalynn Group Title

i did. but none of them look like that. or else i would have known it at first.

17. nincompoop Group Title

so what do you understand about function?

18. nincompoop Group Title

by the way, do you understand the [ ] and | | in A and B respectively?

19. kaylalynn Group Title

i understand the absolute value signs but i dont know what the bracket things are

20. nincompoop Group Title

brackets and curly braces are used when there are nested parentheses to avoid confusion –{2x – [3 – (4 – 3x)] + 6x}

21. kaylalynn Group Title

so it would be B because the graph of y = |x| passes the vertical line test??

22. nincompoop Group Title

so your A is just simply x = y, which is y = x now if you read the attachment, this could mean f(x) = x

23. kaylalynn Group Title

ok so it could mean f(x) = x?

24. nincompoop Group Title

yes, it means that the output is the same as the input f(x) the x inside the parenthesis, gives an output of x f(x) = x f(2) = 2 f(blah) = blah

25. kaylalynn Group Title

oh ok. that makes sense now!

26. kaylalynn Group Title

thanks! i apologize! Im soo tired!

27. nincompoop Group Title

will it pass the vertical or horizontal line test?

28. kaylalynn Group Title

if x = 2 or 3 or 4 etc. it will pass the vertical line test which means it is a function. But it will not pass the horizontal line test which means it is not a 1 - 1 function.

29. kaylalynn Group Title

right?

30. kaylalynn Group Title

sorry i meant y

31. kaylalynn Group Title

x does not pass the vertical line test so it is not a function

32. nincompoop Group Title

input x | output y ------------------ 1 | 1 3 | 3 5 | 5 it is a 1 to 1 no matter what |dw:1365917751738:dw|

33. Directrix Group Title

>> which is a function? @kaylalynn A function f is the set of ordered pairs (x,y) such that if (x1, y1) AND (x1,y2) are elements of f, then y1 = y2.