Find the value of x , y & z

`[ [ x + y + z ] , [ x + z ] , [ y + z ]] = [ [ 9 ] , [ 5 ] , [ 7 ] ]`

Find the value of (( x -y )^3 + ( y - z )^3 + ( z - x )^3 )/ (9 ( x - y )( y - z ) ( z - x )) 1 . 0 2 . 1/9 3 . 1/3 4. 1

x y : y z : z x = 1 : 5 : 9 Find ( x + y ) : ( y + z ) : ( z + x ) = ?

Write the values of x-y+z from the following equation: [[x+y+z], [x+z ],[y+z]]=[[9],[5],[ 7]]

The value of ( x-y ) ( x + y ) + ( y -z ) ( y + z ) + (z-x ) (z + x ) is equal to

Find the value of x,y and z:x+y+z=5,x-y+z=6,x+y-z=11

Add 2x - 3y + z , 5y - x + 7z and 3x - y - 6z.

If [[x+y+z],[x+z],[y+z]] = [[9],[5],[7]] ,then the value of x-y+z is

Find the angle between the planes : (i) 3 x - 6y - 2z = 7 " " 2x + y - 2z = 5 (ii) 4 x + 8y + z = 8 " " and y + z = 4 (iii) 2 x - y + z =6 " " and x + y + 2z = 7 .

Find the values of x, y and z from the following equations: (i) [4 3x5]=[y z1 5] (ii) [x+y3 5+z x y]=[6 2 5 8] (iii) [x+y+z x+z y+z]=[9 5 7]