JEE Main 2026 Mathematics question
If the point of intersection of the lines and lies on xy-plane, then the value of a + b is:
Answer: (C)
Solution
Let the common point be (−1 + 3s, −a + 5s, −b − 1 + 7s) = (2 + u, b + 4u, 2a + 7u). On the xy-plane both z-coordinates are 0: 7s = b + 1 and 2a +
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