How does knowing the slope and y-intercept help you graph and write the equation of a line?

What are “like terms”? why can we only add like terms?

What term makes it inconsistent y=2x - 4 ?

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