直线斜率为-1,则-A/B等于-1,即-(m*m-2m-3)/(2*m*m+m-1)等于-1,解得m等于-1或-2
直线经过p(1,-1)点,将点代入(m*m-2m-3)x+(2*m*m+m-1)y+6=0,得m*m+3m-4=0,解得m等于1或-4.