8. Solve this system of equations
4x − 2y + 3z = 1
x + 3y − 4z = −7
3x + y +2z = 5
Select the appropriate response:

A) x = − 1, y = 2, z = 3
B) x = − 1, y = 4, z = 4
C) x = − 3, y = 2, z = 3
D) x = − 1, y = 4, z = 3

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters