If `3x-4y+z=7;` `2x-z+3y=19 ;` `x+2y+2z=24` , then what is the value of `z` ? (a) 4 (b) 5 (c) 6 (d) 8

If 2x+3y=31,backslash backslash y-z=4 and x+2z=11, then what is the value of x+y+z?( a )12 (b) 13 (c) 15 (d) 16

If x : y : z = 3 : 4 : 9, then what will be the value of (2x + 3y + z) : (2z + x – 3y)?

3x+4y+7z=4, 2x+y+ 3z= 3, x + 2y +3z =8.

4x -5y-11z=12,. x-3y+z=1 2x + 3y-7z = 2

if 2x+3y-3z=0;5x-2y+2z=19;x+7y-5z=5. Then the value of x+y-z is

A(x, y, z)=" min. "(x+y, y+z, z+x) B(x, y, z)="max "(x-y, y-z, z-x) C(x, y, z)=" max"(A(x, y, z), B(x, y, z)) D(x, y, z)=" min "(A(x, y, z), B(x, y, z)) What is the value of A(2, 3, 4)+B(2, 3, 4) ?