1. 1 Solution
2. Infinite Solutions
3. No Solution
A)
If (a1 / a2 != b1 / b2), it involves lines that intersect exactly 1 time.
-- Situation 1
B)
If (a1 / a2 == b1 / b2 == c1 / c2), it's a same line.
-- Situation 2
C)
If (a1 / a2 == b1 / b2 != c1 / c2), lines are parallel.
-- Situation 3
[Cramer's Rule]
where
is the matrix formed by replacing the ith column of
by the column vector
.
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to solve:http://zerojudge.tw/ShowProblem?problemid=a410
Code:
Ref. http://en.wikipedia.org/wiki/Cramer%27s_rule
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