— Are the visitors all from ? — No, there are only 5in the group. A. Germany; Germany B. Germany; Germans C. German; Germans D. German; Germany 答案:B已知一次函数y=kx+b与y轴交于点B(0,9),与x轴的负半轴交于点A,且tan∠BAO=1.今有反比例函数与一次函数y=kx+b的图象交于C、D两点,且BD2+BC2=90.(1)求一次函数的解析式;(2)求反比例函数的解析式.