Which of the following equations represent linear functions?

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2

2x minus y equals 6, x plus y equals negative 3