Mark the correct alternative in the following:

Let a, b, c be positive real numbers. The following system of equations in x, y and z

has

The given system of linear equations is :-

+ - = 1

- + = 1

- + + = 1

Let = p , = q , = r

The equation becomes,

+ - = 1

- + = 1

- + + = 1

The matrix equation corresponding to the above system of equation is

Let A =

|A| =

Taking common from , from and from we get,

|A| = = 0

A unique solution exists.