Which one of these equations represents a quadratic function.(1 point) Responses y=2x−4y=2x−4y is equal to 2 x minus 4 y=2x3−4y=2x3−4y is equal to 2 x cubed minus 4 y=2xy=2xy is equal to 2 x y=2x2−4y=2x2−4y is equal to 2 x squared minus 4

y=2x2−4y=2x^2−4y is equal to 2 x squared minus 4