Determine the system of linear equations associated to the following augmented matrix. Use the variables x, y, and z.

System of equations: 2x - 5y = 8, x + 7z = 15, 9x - 3z = 4.

System of equations: 2y - 5z = 8, x + 7y = 15, 9x - 3z = 4.

System of equations: 2x - 5z = -8, x + 7y = -15, 9x - 3z = -4.

System of equations: 2x - 5z = 8, y + 7z = 15, 9x - 3y = 4.