, ,

When three variable quantities have a constant ratio, their relationship is called a direct variation. It is said that one variable varies directly as the other two vary. The formula for direct variation is , where is the constant of variation.

Solve the equation for , the constant of variation.

Find the Equation of Variation -10x-9y-z=14 , -6x-15y-2z=55 , 8x+9y+z=-20