问题
选择题
若二元一次方程组
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答案
解方程组得：
，x=2 y=-1
代入y=kx+9得：-1=2k+9，
解得：k=-5．
故选B．
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若二元一次方程组
|
解方程组得：
，x=2 y=-1
代入y=kx+9得：-1=2k+9，
解得：k=-5．
故选B．
| 阅读下面的短文，从所给的12个单词中选择合适的10个单词补全短文，每空只填一词。 | |
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