Question

HELP PLEASE!
I need help with part B and part C.

The table shows the outputs y for different inputs x:


Input
(x) 2 4 6 8
Output
(y) 1 2 3 4


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) = 3x – 10. Which relation has a greater value when x = 8? (2 points)
Part C: Using the relation in Part B, what is the value of x if f(x) = 80? (5 points)

Answer 1

so.. what did you get for part A?

Answer 2

That it is a function.Its a function because for every domain theres a range.You can only have one range for each domain.

Answer 3

divide input by 2 see what you get?

Answer 4

right.... well, for part B
is only asking, what's "y" when x = 8 from the table data?
and what's "y" when x = 8 for the expresion f(x)=y = 3x-10?

which one is biggers?

Answer 5

\(\begin{array}{llll}
x&y
\\\hline\\
2&1\\
4&2\\
6&3\\
{\color{red}{ 8}}&{\color{blue}{ 4}}
\end{array}\qquad \qquad
\begin{array}{llll}
f(x)={\color{blue}{ y}}=3{\color{red}{ x}}-10
\\ \quad \\
f(x)={\color{blue}{ y}}=3{\color{red}{ (8)}}-10

\end{array} \)

Answer 6

so... notice what "y" is for the data table, is 4, when x =8
what about the 3x-10? when x = 8, what is "y"?

Answer 7

y = f(x) = x/2

Answer 8

what @jdoe0001 is struggling to say is that a function is a special type of relation in which there is a one-to one correspondence between the x(input) and the y(output)