A pair of perpendicular straight lines i...

A pair of perpendicular straight lines is drawn through the origin forming with the line `2x+3y=6` an isosceles triangle right-angled at the origin. The equation to the line pair is `5x^2-24 x y-5y^2=0` `5x^2-26 x y-5y^2=0` `5x^2+24 x y-5y^2=0` `5x^2+26 x y-5y^2=0`

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