सिद्ध कीजिए कि समतल `2x + 6y + 6z = 7` और `3x + 4y - 5z = 8` परस्पर लंबवत है।

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 =

The angle between the planes 2x + 6y + 6z = 9, 3x + 4y – 5z = 9 is

The system 2x + 3y + z= 5, 3x + y + 5z =7, x + 4y -2z=3 has

Using matrix methos show that the following system of equations has infinite number of solutions: 2x - 3y + 4z = 7, 3x - 4y + 5z = 8, 4x - 5y + 6z = 9

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 .