Let $C$ be the locus of the mirror image of a point on the parabola $y ^ { 2 } = 4x$ with respect to the line $y = x$. Then the equation of tangent to $C$ at $P ( 2,1 )$ is : (1) $x - y = 1$ (2) $2x + y = 5$ (3) $x + 3y = 5$ (4) $x + 2y = 4$
Let $C$ be the locus of the mirror image of a point on the parabola $y ^ { 2 } = 4x$ with respect to the line $y = x$. Then the equation of tangent to $C$ at $P ( 2,1 )$ is :\\
(1) $x - y = 1$\\
(2) $2x + y = 5$\\
(3) $x + 3y = 5$\\
(4) $x + 2y = 4$