If the three lines $x - 3y = p, ax + 2y = q$ and $ax + y = r$ form a right-angled triangle then
If the three lines $x - 3y = p, ax + 2y = q$ and $ax + y = r$ form a right-angled triangle then
- [JEE MAIN 2013]
- A
$a^2 -9a + 18 =0$
- B
$a^2 -6a-12=0$
- C
$a^2 -6a- 18=0$
- D
$a^2 -9a+ 12 =0$
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- [IIT 1973]
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