Concurrency of Three Lines
Straight Line

88794 One possible condition for the three points (a, b), (b, a) and \(\left(a^{2},-b^{2}\right)\) to be collinear, is

1 \(a-b=2\)
2 \(a+b=2\)
3 \(\mathrm{a}=1+\mathrm{b}\)
4 \(\mathrm{a}=1-\mathrm{b}\)
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