Question

(1)求点P(0,1)关于直线2x+y+6=0对称点Q的坐标.(2)求直线2x+y+6=0关于点P(0,1)对称的直线方

Answer 1

(1)设Q(m,n),对称轴2x+y+6=0垂直平分PQ,∴(n-1)/m*(-2)=-1,2*m/2+(n+1)/2+6=0,化简得m=2n-2,①2m+n+13=0,②把①代入②,5n+9=0,n=-9/5,代入①,m=-28/5.∴Q(-28/5,-9/5).(2)点M(x,y)关于P(0,1)的对称点M'为(-x,2-y),∴...