Blueprints were a low-cost alternative to copying designs onto paper or linen. where were blueprints first developed?

-britain
-germany
-united states

tbh, either pop or, i know it's not on the list, but indie/ alternative.

coordinates of r(b,c)

slope of nm is 0.

step-by-step explanation:

the midpoint of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

the midpoint of the line segment nk is given by

∴r(b,c)

the slope of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

slope of rs is

hence

coordinates of r(b,c)

and slope of nm is 0.