1.

A variable line L si drawn through O(0,0) to meet lines L_1 and L_2 " given by " y-x-10=0 and y-x-20=0 at point A and B, respectively. A point P IS taken on L such that 2//OP=1//OA+1//OB. Then the locus of P is

Answer»

`3x+3y=40`
`3x+3y+40=0`
`3x-3y=40`
`3y-3x=40`

ANSWER :D


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