Solve:x(x+y+z)=6,
`y(x+y+z)=12,z(x+y+z)=18`

Solve :(x+y)(x+y+z)=18,(y+z)(x+y+z)=30,(x+z)(x+y+z)=2

Solve : 2x-y+z=4 , x+3y+2z=12 , 3x+2y+3z=16

A person travels three equal distances at a speed of x km/hr, y km/hr and z knyhr respectively. What is the average speed for the whole journey? (x y z)/(3(x y+y z+z x)) b. (x y z)/((x y+y z+z x)) c. ((x y+y z+z x))/(x y z) d. (3x y z)/((x y+y z+z x))

x+y+z=6 x + 2z =7, 3x + y + z = 12

Solve: 2x-y+z=4,x+3y+2z=12,3x+2y+3z=16

Solve x-y+z=4 , x+y+z=2 , 2x+y-3z=0

Solve 3x-y+2z=12, x+2y+3z=11, 2x-2y-z=2

Solve by matrix inversion method the following system of equations. x + y + z = 6, x + 2z = 7, 3x + y + z = 12

Prove: |(y+z, z, y),( z, z+x,x),( y, x,x+y)|=4\ x y z

Prove: |(y+z, z, y),( z, z+x,x),( y, x,x+y)|=4\ x y z