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The domain of y = -4x is all real numbers.
The domain can be anything you like: a single element, all real numbers, all complex numbers, etc.
The domain is anything you want it to be. You could define the domain to be integer values only, or it could be {-3, -2.5, .2, 0, sqrt(7), 9}.
The answer depends on the domain - the set of values that x can take..
It is the infinite set of points of the form [x, (4x+9)/7] for all value of x in its domain.