`x/4=y/3=z/2`, `7x+8y+5z=62`

If x/2=y/3=z/7 then (2x-5y+4z)/(2y)=

Solve the following systems of linear equations by Gaussian elimination method. 2x+4y+6z=22,3x+8y+5z=27,-x+y+2z=2

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

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

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

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