st-line

Question: The three straight lines $ax+by=c,\,\,bx+cy=a$ and $cx+ay=b$ are collinear, if

1) $a+b+c=0$

2) $b+c=a$

3) $c+a=b$

4) $a+b=c$

Solution:

Explanation: No Explanation

Concurrency of three lines

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