如图，已知反比例函数y=的图象经过点A（1，-3），一次函数y=kx+b的图象经过点A与点C（0，-4），且与反比例函数的图象相交于另一点B(3，n)。（1）试确定这两个函数的解析式；（2）求△-九年

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