By how much is 2x - 3y + 4z greater than 2x + 5y - 6z + 2?

By how much is 5x-3y+4z greater than 5x-2y+2z+5

How much is x-2y+3z greater than 3x+5y-7?

By how much is 4y^2-3x^2+9 greater than 2y^2-6x^2-6

The planes 2x - y + 4z = 3 and 5x - 2.5y + 10z = 6 are :

The planes : 2x - y + 4z = 5 and 5x - 2.5y + 10z = 6 are

2x = 3y = 4z, x: y: z

How much less than x - 2y + 3z is 2x - 4y -z?

In the following determine whether the given planes are parallel or perpendicular and in case they are neither, find the angles between them : (i) 7x + 5y + 6z + 30 = 0 and 3x - y - 10z + 4 = 0 (ii) 2x + y + 3z - 2 = 0 and x - 2y + 5 = 0 (iii) 2x - 2y + 4z + 5 = 0 and 3x - 3y + 6z - 1 = 0 (iv) 2x - y + 3z - 1 = 0 and 2x - y + 3z + 3 = 0 (v) 4x + 8y + z - 8 = 0 and y + z - 4 = 0.

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