JEE Main 2025 Mathematics question
If the system of linear equations : x + y + 2z = 6, 2x + 3y + az = a + 1, –x – 3y + bz = 2b, Where a, b has infinitely many solutions, then 7a + 3b is equal to :
Answer: (3)
Solution
From : ; from : . Solving gives , so .