Click and drag the explicit formula for the functions mapped from Z to Z . in the right, to their descriptions, in the left. a function from Z to Z- that is one-to-one but not onto a function from Z to Z- that is not one-to-one but that is onto f (x) = |x| + 1 f (x) = 2x + 1 when x 20 f (x) = -2x when x