## lexy148 one year ago i need help graphing this, can someone help. The domain is negative infinity < x < + infinity and has a range of negative infinity < y< + infinity.

1. misty1212

HI!!

2. misty1212

can you graph anything with that domain and range?

3. lexy148

|dw:1440551238566:dw| i was thinking something like this but i dont know if its correct

4. misty1212

no it is not

5. misty1212

if the domain is $$(-\infty, \infty)$$ you could just use $$y=x$$

6. lexy148

i still dont get what your trying to say

7. misty1212

|dw:1440551451386:dw|

8. lexy148

why wouldnt it be curved

9. misty1212

it just says graph anything right?

10. misty1212

you can make it curved, but it has to have domain all real numbers, your picture did not

11. misty1212

|dw:1440551570139:dw|

12. misty1212

maybe i do not understand the question seems very open ended

13. lexy148

yeah thats correct what your telling me

14. lexy148

it also ask to write the maximum and minimum for each one

15. misty1212

can you post a picture or screenshot or something?

16. misty1212

i think there is more to the question than "graph anything with domain and range all real numbers" maybe i am wrong, but it seems to open ended besides, who ways it has a max or min also you wrote "each one" like there could be several

17. lexy148

let me post it give me a sec

18. misty1212

kk

19. lexy148

20. lexy148

i sent you a pic of the question

21. misty1212

lol i thought so !!

22. lexy148

its number 2

23. misty1212

you actually have a graph, don't you?

24. misty1212

oooh

25. misty1212

ok in that case it says pretty much what you said, but you missed "always increasing"

26. lexy148

27. misty1212

ok so we can use a specific example of a function that is always increasing why make it hard, use $$f(x)=x$$ that has domain and range all real numbers, and is strictly increasing

28. misty1212

Q) does your function have any max or min? A) NO, if it is strictly increasing, it cannot have a local max or min because it keeps going up!

29. misty1212

actually that answers both questions, the specific one and the general one

30. lexy148

ok thank you for the help i can answer the rest on my own. just the graphing got me confused

31. misty1212

also it means my second example above, the curvy one, is wrong, since it is not strictly increasing

32. misty1212

$\color\magenta\heartsuit$

33. lexy148

ok got that but the straight one would be correct

34. misty1212

yes it would

35. lexy148

kk thx :)