若3X-Y-7=2X+3Y-1=Y-KX+9=0,则K的值为( )A.3B.-3C.4D.-4

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若3X-Y-7=2X+3Y-1=Y-KX+9=0,则K的值为( )A.3B.-3C.4D.-4
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若3X-Y-7=2X+3Y-1=Y-KX+9=0,则K的值为( )A.3B.-3C.4D.-4
若3X-Y-7=2X+3Y-1=Y-KX+9=0,则K的值为( )
A.3
B.-3
C.4
D.-4

若3X-Y-7=2X+3Y-1=Y-KX+9=0,则K的值为( )A.3B.-3C.4D.-4
K 等于4