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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)
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)

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A. Yes because for every input, you have an output (?)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Because each input is related to exactly one output.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0In Part B, you need to find the value of x first in 5x21, do you know how to do that? If you do, you'll just compare it and conclude your answer!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0This is what i got for Part B: f(11)=5(11)21 @ienarancillo

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ohh, I had a different way of understanding it :((

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0from what I understand, there's this f(x) = 5x  21 right? So, I guess you need to find x first And that is ..?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0honestly i have no idea im so confused.. @ienarancillo

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0just find x in 5x21 :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so its 34? because i plugged in the 11 for x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah, meaning that the function in part b has a greater value

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0as for C, plug in 99 for x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0uhm wait a sec, \[f(x)=y=5x21\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[y=\frac{ 5x }{ 5 }=\frac{ 21 }{ 5 }\] \[y=f(x)=\frac{ 21 }{ 5 } \approx 4.2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but looking at the table, when x = 11 , y = 8

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so comparing y = 4.2 y = 8 I think you know it form here :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but please correct me if I'm wrong bc this is how I understood the problem

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0im still confused :(

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0let's start from the top

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oso we're given f(x)=5x21 right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0^ from that given equation, do you know how to find x?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0* guys please correct me if I'm wrong! :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah i plugged in the 11 for x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Noo, if you plug in x, you'll get y. just dont mind the x=11 first, that's a different function

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0like y = 5(11)21 You get y here! Not x! :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sooo transposing .. we get \[5x = 21\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and then, we want to find x so divide both sides by 5 \[\frac{ 5x }{ 5 } = \frac{ 21 }{ 5 }\]
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