Question

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)

Answer 1

How would you define a function?

Answer 2

well, a function means, no X-REPEATS
if the function has any x-repeats in its "input" values, then is NOT a function

Answer 3

so.... any ideas? \(\begin{array}{ccllll}
x&y
\\\hline\\
3&4\\
7&6\\
11&8\\
15&10
\end{array}\)