The following system of linear equations

Question:

The following system of linear equations

$2 x+3 y+2 z=9$

$3 x+2 y+2 z=9$

$x-y+4 z=8$

  1. has a solution ( $\alpha, \beta, \gamma)$ satisfying $\alpha+\beta^{2}+\gamma^{3}=12$

  2. has infinitely many solutions

  3. does not have any solution

  4. has a unique solution


Correct Option: , 4

Solution:

$2 x+3 y+2 z=9$......(1)

$3 x+2 y+2 z=9$........(2)

$x-y+4 z=8$........(3)

$(1)-(2) \Rightarrow-x+y=0 \Rightarrow x-y=0$

from (3) $4 \mathrm{z}=8 \Rightarrow \mathrm{z}=2$

from (1) $2 x+3 y=5$

$\Rightarrow x=y=1$

$\therefore$ system has unique solution

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