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1. |
Given a family of lines a \[a(2x+y+4)+b(x-2y-3)=0\] the number of lines belonging to the family at a distance \[\sqrt{10}\] from \[P(2,-3)\] is |
A. | 0 |
B. | 1 |
C. | 2 |
D. | 4 |
Answer» C. 2 | |