Draw y=-2x in the same plane rectangular coordinate system? y=-2x? +1 y=-2x? Image of -1

(2) The same point, the opening is downward, and the symmetry axis is the Y axis. Vertices are different. Vertex coordinates are (,), (,1),

(,1)

(3) parabola y=-2x? Translate one unit up to get y=-2x? +1 image; Parabola y=-2x? Translate one unit down to get y=-2x? -1 image.

hope to adopt it, and keep asking if you don't understand.