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327. Find the values of.x, y and z from the following equations : $open square brackets table row cell x plus y plus z end cell row cell x plus z end cell row cell y plus z end cell end table close square brackets equals open square brackets table row 9 row 5 row 7 end table close square brackets$

We are given that

open square brackets table row cell x plus y plus z end cell row cell x plus z end cell row cell y plus z end cell end table close square brackets equals open square brackets table row 9 row 5 row 7 end table close square brackets

By definition of equality of matrices.
x.+ y + z = 9    ,..(1)
.x + z = 5    ...(2)
y + z = 7    ...(3)
Subtracting (2) from (1), y = 4
Subtracting (3) from (1). x = 2
∴from (2), 2 + z = 5 ;⇒ z =3
∴x = 2, .y = 4, z = 3

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328. Find the values of a. b, c and rf from the equation :

open square brackets table row cell straight a minus straight b space space space space space space space space space space end cell cell 2 straight a plus straight c end cell row cell 2 straight a minus straight b space space space space space space space space space end cell cell 3 straight c plus straight d end cell end table close square brackets equals open square brackets table row cell negative 1 end cell 5 row 0 13 end table close square brackets

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329.

If space open square brackets table row straight x cell 3 straight x minus straight y end cell row cell 2 straight x plus straight z end cell cell 3 straight y minus straight w end cell end table close square brackets equals open square brackets table row 3 2 row 4 7 end table close square brackets

find x, y, x, w'

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330. Find ,x, y , a and b if

open square brackets table row cell 2 straight x minus 3 straight y end cell cell straight a minus straight b end cell 3 row 1 cell straight x plus 4 straight y end cell cell 3 straight a plus 4 straight b end cell end table close square brackets equals open square brackets table row 1 cell negative 2 end cell 3 row 1 6 29 end table close square brackets

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327. Find the values of.x, y and z from the following equations : $open square brackets table row cell x plus y plus z end cell row cell x plus z end cell row cell y plus z end cell end table close square brackets equals open square brackets table row 9 row 5 row 7 end table close square brackets$