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题目设m∈R,在平面直角坐标系中,已知向量a=(mx,y+1),b=(x,y-1),a⊥b,动点M(x,y)的轨迹为E。(Ⅰ)求轨迹E的方程,并说明该方程所表示曲线的形状;
The topic is set m∈R, in the rectangular Cartesian coordinate system, known vectors a = (mx, y + 1), b = (x, y-1), a⊥b, the trajectory of the moving point M E. (Ⅰ) Find the equation of trajectory E, and explain the shape of the curve represented by this equation;