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

Solve the following system of equations by matrix method: 3x+4y+7z=14 ,\ \ 2x-y+3z=4,\ \ x+2y-3z=0

Solve using matrices, for x,y and z: 2x-y-z = 7, 3x+y - z = 7, x + y - z = 3.

Add : 8x - 3y + 7z, -4x + 5y - 4z, -x - y - 2z

2x-3y+5z=16, 3x+ 2y-4z= -4, x + y - 2z =- 3.

Solve by matrix method 3x - 4y + 2z = -1 , 2x + 3y +5z = 7 , x+ 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 .