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## Main Question or Discussion Point

I'm thinking the term is

For example, let's say there are 2 parametric lines:

s

s

The loci for both are the same line, just that one proceeds in the opposite as the other (and at a high rate) per change in parameter, and such that

s

Surely, there must be a term for this.

*congruent*.For example, let's say there are 2 parametric lines:

s

_{0}( t ) = < 2 , 1 > t + < 0 , - 3 >s

_{1}( t ) = < -18 , -9 > t + < -6 , -6 >The loci for both are the same line, just that one proceeds in the opposite as the other (and at a high rate) per change in parameter, and such that

s

_{1}( - t ) = s_{0}( 9 t + 3 )Surely, there must be a term for this.