line equation

13 LETTERS · STARTS WITH L

line equation is a valid 13-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1I1N1E1E1Q10U1A1T1I1O1N1

1 + 1 + 1 + 1 + 0 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does line equation mean?