How can i use pythagorean theorem to find g & h ?

Sorry guys but as you have a small brain

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

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