Question

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

Answer 1

A. This is a function because there is one x value for every y value. Basically, that means every x is different, there are no repeating x's. A function can have repeating y values, just not the x ones.

B. 
table : when x = 4...u already have that point (4,9)...so this value is 9.

relation :
f(x) = 2x - 8...when x = 4
f(4) = 2(4) - 8
f(4) = 8 - 8
f(4) = 0

so the greater values goes to the table....with a value of 9 <==

C. f(x) = 34

f(x) = 2x - 8
34 = 2x - 8
34 + 8 = 2x
42 = 2x
21 = x <==