If `x+y : y+z : z+x=6:7:8` and `x+y+z=14` , find `z` (a) 6 (b) 7 (c) 8 (d) 10

If x = 10a, y = 3b , z = 7c and x : y : z = 10 : 3 : 7 , then (7x + 2y + 5z)/(8a + b + 3c) =

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

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

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

Find x, y,z and w if [(xy, w), (z+6 , x+y)] = [(8,2), (0,6)] .

If x + y = 5, y + z = 7, z + x = 6, then the value of x, y and z are

If x = 6a + 8b + 9c, y = 2b - 3a - 6c and z = c - b + 3a, find : x + y + z

solve x + 2y + 3z = 8 2x + y + z = 8 x + y + 2z = 6 .

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 .