2x2x2 = 8
4 x 2 x 2 = 16
16+8 = 24
Answer is A
The answers tell you the y-intercept is zero, so all you need to do is choose the appropriate slope. Since y/x = -4, ...
.. selection A is appropriate.
For f(x) to be a function, the value of x should not be repeated. That is no x value can be more then once.
So the required table is

And for g(x) , not to be a function, we have to repeat x value that is

I believe its 1048576/6561<span />