If y is a function of x in y=2x-4 which of the following statements is true?

a) The ndependent variable, y, is 4 less than 2 times the
dependent variable, x

b) The dependent variable, y,
is 4 less than 2 times the
independent variable, x.

c) The independent variable, x, is 4 less than 2 times the
dependent variable, y

d) The dependent variable, x, is 4 less than 2 times the
independent variable, y