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The diagonals of a parallelogram PQRS are along the lines x+3y =4 and 6x-2y = 7, Then PQRS must be :

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The diagonals of a parallelogram PQRS are along the lines x+3y =4 and 6x-2y = 7, Then PQRS must be :
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`L_1:x+3y=4`
`m_(L1)=-1/3`
`L_2:6x-2y=7`
`m_(L2)=3`
`m_(L1)*m_(L2)`
`-1/3*3=-1`.
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