Verified Solution • 2025–26 Session moderate

QJEEM21Ma56d5: JEE Main 2021 Mathematics - Class 12 JEEM21Ma56d5 Solution: If the system of linear equations 2x + y z = 3 x y z = 3x + 3y…

If the system of linear equations

2x + y −- z = 3

x −- y −- z = α\alpha

3x + 3y + β\beta z = 3

has infinitely many solution, then α\alpha + β\beta −- α\alpha β\beta is equal to _____________.

Step-by-Step Verified Solution

2 ×\times (i) −- (ii) −- (iii) gives :

−- (1 + β\beta )z = 3 −- α\alpha

For infinitely many solution

β\beta + 1 = 0 = 3 −- α\alpha ⇒\Rightarrow ( α\alpha , β\beta ) = (3, −- 1)

Hence, α\alpha + β\beta −- α\alpha β\beta = 5

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