{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`

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{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`{5=3K+B,-9=-4K+B求K和B`急

{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`
{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`

{5=3K+B,-9=-4K+B求K和B`急`````谢```````过程吖`
因为5=3k+b,所以b=5-3k
因为-9=-4k+b,所以b=-9+4k
所以5-3k=-9+4k
14=7k
k=2
代入第一个式子中5=3x2+b
b=-1

K=2,B=-1

k=2,B=-1

{5=3K+B,-9=-4K+B
3k+b-14=-4k+b
7k-14=0
k=2 b=-1