Find value of x in equation [ c x+y+z x+z y+z ]= [ l 9 5 7 ] - Vidyadip

MCQ

Find value of $x$ in equation $\left[\begin{array}{c}x+y+z \\ x+z \\ y+z\end{array}\right]=\left[\begin{array}{l}9 \\ 5 \\ 7\end{array}\right]$

A
$3$
B
$4$
C
$5$
✓
$2$

✓

Answer

Correct option: D.

$2$

$x+y+z=9$
$y+z=7$
Subtracting equation $(ii)$ from $(i)$
$x=9-7$
$=2$

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