## calculusxy one year ago MEDAL!!! Find the x- and y-intercepts for the graphs of the relationships in the problem.

1. calculusxy

2. calculusxy

@robtobey @jdoe0001

3. calculusxy

@dan815

4. dan815

an x value can have one y value only for it to be a function of only x

5. calculusxy

But how is that answering the question? @dan815

6. dan815

look at the pic you attached

7. calculusxy

How would I figure out the x- and y-intercepts ?

8. dan815

what is y when x=0,y-int what is x when y=0, xint

9. calculusxy

So for like A, would it be: y-intercept : (0,4) x-intercept: (1,0) ?

10. dan815

x-intercept: (1,0) and (-1,0)

11. calculusxy

Oh yeah. Thanks. Can I go over with you for the other three as well?

12. dan815

okay

13. calculusxy

14. calculusxy

I am confused on B.

15. calculusxy

This is a function, but it doesn't look like a linear function. I wish I knew the slope, and then figure out "b."

16. dan815

you work with the data only

17. dan815

what is y when x=0,y-int what is x when y=0, xint

18. calculusxy

Oh. y-int : (0,-3) x-int : (19,0)

19. dan815

yes

20. calculusxy

C...

21. calculusxy

y-int : (0,10) x-int : (4.0)

22. calculusxy

And then D... y-int: (0,-1) x-int : (1,0) and (-1,0) ?

23. dan815

C) y-int : (0,10) x-int : (4,0) and (-2,0)

24. calculusxy

Sorry missed the other. But thanks.

25. dan815

D is right

26. calculusxy

I have another question.

27. dan815

ok

28. calculusxy

Find the input for the following function with the given outputs. If there is no possible input for the given output, explain why not. x = ? $f(x) = \sqrt{2x - 6}$ $\rightarrow f(x) = 10$

29. anonymous

d is correct

30. dan815

$10=\sqrt{2x-6}\\ 10^2=2x-6\\ 10^2+6=2x\\ \frac{(10^2+6)}{2}=x$

31. dan815

x=53

32. calculusxy

x = 53 ?

33. calculusxy

Okay. Thank you. And I just wanted to make sure my answers to two other questions.

34. calculusxy

So this one is the same thing as the one that we just did right now but the number is different: x = ? $f(x)=3x - 7$ $\rightarrow f(x) = -1$ My answer is:$x = 2$

35. dan815

3*2-7=-1

36. calculusxy

This one is with the four graphs/tables that I gave at first in the attachment. Question: Which of the relationships are functions? If a relationship is not a function give a reason to support your conclusion. Answer: Relationships B, C, and D are all functions because every input has only one output. However, for A, you can see that for an input, you have several outputs.

37. dan815

C is not a function

38. dan815

of x

39. calculusxy

So C is not a function?

40. calculusxy

@dan815