`x + y + z = 6 , x - y + 2 z = 5 , 3 x + y + z = 8` solve it​

2x + 3y + z = 11, x + 2y + z = 8, x-y + z = 2

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 .

8x + y + 2z = 4x + 2y + z = 1x + y + z = 2

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

2x + 3y-5z = 7, x + y + z = 6,3x-4y + 2z = 1, then x =

Prove that the lines 3x + 2y + z – 5 = 0 = x + y – 2z – 3 and 2x – y – z = 0 = 7x + 10y – 8z – 15 are perpendicular

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

Prove that Det [[x + y + 2z, x, y], [z, y + z + 2x, y], [z, x, z + x + 2y]] = 2 (x + y + z) ^ 3

Solve the following set of equations 2x+3y -z = 9; x +y +z = 9; 3x - y - z = -1 .

Subtract the sum of 5x - 4y + 6z and -8x + y - 2z from the sum of 12x - y + 3z and -3x + 5y - 8z