Let P(h, k) be the point which is equidistant from the point (2, 4) and the y-axis. The distance of point P(h, k) from the y-axis is h. ∴h=h-22+k-42⇒h2-4h+4+k2-8k+16=h2⇒k2-4h-8k+20=0 Hence, the locus of (h, k) is y2-4x-8y+20=0.
Find the locus of a point which is equidistant from (1,3) and x-axis.