The Taxi fare in Edmonton is $15 for the first kilometer and $10 per kilometer for subsequent distance covered. If the distance is represented as x, and the fare is represented as y, find the linear equation for this relationship.
^@ABCD^@ is a square with each side measuring ^@64 \space cm^@. ^@M^@ is a point on ^@CB^@ such that ^@CM = 16 \space cm^@. If ^@N^@ is a variable point on the diagonal ^@DB^@, find the least value of ^@CN + MN^@.