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Two sides of a rhombus are along the lin...

Two sides of a rhombus are along the lines,`x-y+1=0` and `7x-y-5=0` . If its diagonals intersect at `(-1,-2)` , then which one of the following is a vertex of this rhombus ?

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equations are; `x-y+1=0`
`x-y-5=0`
subtracting 1 from 2
`6x-6=0`
`x=1`
`y=2`
`(1,2) & (-1,-2)`
`m = (2- (-2))/(1-(-1)) = 4/2 = 2`
...
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