UPSEE 2018 Solved Paper

Let point P(h,k) is moving point.
Such that the sum of distance from two parpendicular line x=0 and y=0 in a plane is always 1 .
∴AP+PB=1
⇒k+h=1⇒h+k=1
∴ Locus of the curve is
x+y=1
which represent the equation of line.