The table shows the outputs, y, for different inputs, x:

Question

Input (x)
1
3
5
7
Output (y)
8
6
5
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) = 4x + 8. Which relation has a greater value when x = 3? (2 points)

Part C: Using the relation in Part B, what is the value of x if f(x) = 76? (5 points)

Answer 1

looks like for every value of x there is only one value of y, so yes, it is a function.

b) well, just evaluate f(3)

c) set 4x+8 = 76 and solve for x