Consider △rst and △ryx. triangle r s t is shown. line x y is drawn parallel to side s t within triangle r s t to form triangle r y x. if the triangles are similar, which must be true? startfraction r y over y s endfraction = startfraction r x over x t endfraction = startfraction x y over t s endfraction startfraction r y over r s endfraction = startfraction r x over r t endfraction = startfraction x y over t s endfraction startfraction r y over r s endfraction = startfraction r x over r t endfraction = startfraction r s over r y endfraction startfraction r y over r x endfraction = startfraction r s over r t endfraction = startfraction x y over t s endfraction\