JEE Main 2012 Mathematics question
Consider the straight lines
: x - y = 1
: x + y = 1
: 2x + 2y = 5
: 2x - 2y = 7
The correct statement is
Answer: (4)
Solution
Slopes: , : 1; , : −1. So (distinct), , and every slope-1 line is perpendicular to every slope-(−1) line. (4) is
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