【请帮我想想如何用较简便的方法解这题：过直线x+y+1=0和圆x^2+y^2-2x-2y-7=0的交点,且面积最小的方程为：A(x+1/2)^2+(y+1/2)^2=9/2B（x-1/2)^2+（y-1/2）^2=9/2C(x-1/2)^2+(y+1/2)^2=9/2D(x+1/2)^2+(y-1/2)^2=9/2】

　　请帮我想想如何用较简便的方法解这题：过直线x+y+1=0和圆x^2+y^2-2x-2y-7=0的交点,且面积最小的方程为：

　　A(x+1/2)^2+(y+1/2)^2=9/2

　　B（x-1/2)^2+（y-1/2）^2=9/2

　　C(x-1/2)^2+(y+1/2)^2=9/2

　　D(x+1/2)^2+(y-1/2)^2=9/2