## anonymous one year ago can someone help pls. The table shows the outputs y for different inputs x: Input (x) 3 7 11 15 Output (y) 4 6 8 10 Part A: Do the data in this table represent a function? Justify your answer. (3 points) Part B: Compare the data in the table with the relation f(x) = 5x – 21. Which relation has a greater value when x = 11? (2 points) Part C: Using the relation in Part B, what is the value of x if f(x) = 99? (5 points)

1. anonymous

A. Yes because for every input, you have an output (?)

2. anonymous

Because each input is related to exactly one output.

3. anonymous

In Part B, you need to find the value of x first in 5x-21, do you know how to do that? If you do, you'll just compare it and conclude your answer!

4. anonymous

This is what i got for Part B: f(11)=5(11)-21 @ienarancillo

5. anonymous

Ohh, I had a different way of understanding it :((

6. anonymous

from what I understand, there's this f(x) = 5x - 21 right? So, I guess you need to find x first And that is ..?

7. anonymous

honestly i have no idea im so confused.. @ienarancillo

8. anonymous

just find x in 5x-21 :)

9. anonymous

so its 34? because i plugged in the 11 for x

10. anonymous

yeah, meaning that the function in part b has a greater value

11. anonymous

as for C, plug in 99 for x

12. anonymous

uhm wait a sec, $f(x)=y=5x-21$

13. anonymous

$y=\frac{ 5x }{ 5 }=\frac{ 21 }{ 5 }$ $y=f(x)=\frac{ 21 }{ 5 } \approx 4.2$

14. anonymous

but looking at the table, when x = 11 , y = 8

15. anonymous

so comparing y = 4.2 y = 8 I think you know it form here :)

16. anonymous

but please correct me if I'm wrong bc this is how I understood the problem

17. anonymous

im still confused :(

18. anonymous

let's start from the top

19. anonymous

oso we're given f(x)=5x-21 right?

20. anonymous

^ from that given equation, do you know how to find x?

21. anonymous

* guys please correct me if I'm wrong! :)

22. anonymous

yeah i plugged in the 11 for x

23. anonymous

Noo, if you plug in x, you'll get y. just dont mind the x=11 first, that's a different function

24. anonymous

like y = 5(11)-21 You get y here! Not x! :)

25. anonymous

do you get it?

26. anonymous

yeaah

27. anonymous

sooo transposing .. we get $5x = 21$

28. anonymous

and then, we want to find x so divide both sides by 5 $\frac{ 5x }{ 5 } = \frac{ 21 }{ 5 }$

29. anonymous

so far so good?