Family through intersection of two lines (All lines through intersection of L1=0 and L2=0 (parameter λ).)

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All lines through intersection of L1=0 and L2=0 (parameter λ).

What each symbol means

SymbolWhat it stands for
λReal parameter
L1,L2Left-hand sides ax+by+c for two lines

When to use this

L1 and L2 not identical multiples.