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单选题
5a + 9b = 1415a-tb = 38For which of the following values of t will there be no solutions to the system of equations given above?
A
27
B
18
C
0
D
-18
E
-27
参考答案
参考解析
解析：
因为5a + 9b = 14，所3(5a + 9b)= 15a+27b=3× 14= 42，又因为15a-tb = 38，明显看出E项中t=-27不符合，因为当t=-27时，可得出15a+27b=38，又因为根据题干知15a+27b=42，故选E。
因为5a + 9b = 14，所3(5a + 9b)= 15a+27b=3× 14= 42，又因为15a-tb = 38，明显看出E项中t=-27不符合，因为当t=-27时，可得出15a+27b=38，又因为根据题干知15a+27b=42，故选E。
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