M(x0,y0)为圆x2+y2=a2(a>0)内异于圆心的一点,则直线x0x+y0y=a2与该圆的位置关系是( )
A:相切
B:相交
C:相离
D:相切或相交
已知y=kx+b,当x=1时,y=﹣1;当x=3时,y=﹣5,则k= ____,b= ____.
She works hard in order to make her dream _______