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

(2) At the same point, the opening is downward and the axis of symmetry is the Y axis. The vertices are different. Vertex coordinates are (0,0), (0, 1) respectively,

(0,- 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.

I hope to adopt it, but I don't know how to keep asking.