Given matrix equation is
On equating the corresponding elements, we get
x + y z = 9 .......(i)
x + z = 5 ........(ii)
y + z = 7 ........(iii)
On putting the value of x + z from Eq. (ii) in Eq. (i),we get
y + 5 = 9
y = 4
On putting y = 4 in Eq.(iii), we get z = 3
Again, putting z = 3 in Eq. (ii), we get x = 2
x - y + z = 2-4+3 = 1
