(04.01 lc)
which of the tables represents a function

Table 2

For every input, there is one output.

Why table 1 is not a function:

The input 5 has two outputs, 3 and 2

Why table 3 is not a function:

The input 1 has two outputs, 2 and 3

Why table 4 is not a function:

The input 4 has three outputs, 2, 3, and 4

Hope this helps!

it would be 6xy and -16xy.