numeral / noun
two
TOO/tˈu/
The number immediately following one.
These two matching red apples are easy to count.

Etymology
Old English twā already meant the number two, but was used with feminine and neuter nouns. The corresponding masculine form survives as twain, preserving an old grammatical distinction.
In context
we're just plotting two curves y is just sort of a dummy variable so this point where the two intersect there's just one intersection point
More examples
- We need two more chairs at the table.
- She rolls a two on her first turn.
- The children line up in twos before lunch.
Forms
two · twos
twice adverb — On two occasions or in double measure.