4X+3Y=1 2AX+(A-1)Y=3的解xy互为相反数,则a

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4X+3Y=1 2AX+(A-1)Y=3的解xy互为相反数,则a
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4X+3Y=1 2AX+(A-1)Y=3的解xy互为相反数,则a
4X+3Y=1 2AX+(A-1)Y=3的解xy互为相反数,则a

4X+3Y=1 2AX+(A-1)Y=3的解xy互为相反数,则a
因为XY为相反数,所以X+Y=0,所以4X+3Y=3(X+Y)+X=1,所以X=1,Y=-1.
由2AX+(A-1)Y=3得2A—(A-1)=3,解得A=2