HELP!!
A small office unit is to contain 600 ft2
of floor space. A simplified model is shown in the
figure.
(a) Use an equation to express the length y of the building in terms of the width x.

(b) If the walls cost $100 per running foot, use an equation to express the cost C of the
walls in terms of the width x. (Disregard the wall space above the doors and the thickness
of the walls.)
wall space above the door=3'

Question

HELP!!
A small office unit is to contain 600 ft2
of floor space. A simplified model is shown in the 
figure.
(a) Use an equation to express the length y of the building in terms of the width x.
  
(b) If the walls cost $100 per running foot, use an equation to express the cost C of the 
walls in terms of the width x. (Disregard the wall space above the doors and the thickness 
of the walls.)
wall space above the door=3'

anonymous · Answer

attachment

anonymous · Answer

is a) y(x)=600/x?

anonymous · Answer

is y=2x? I can only assume so much from what is given.
I think a is:
y(x)=2x

anonymous · Answer

did you see the attached picture?

goformit100 · Answer

(b) If the walls cost $100 per running foot, use an equation to express the cost C of the

phi · Answer

is a) y(x)=600/x?

yes
we know the area of a rectangle is width*length. Here x*y= 600  and
y= 600/x

phi · Answer

It sounds like the total length of the walls is 3*x+2*y-6  :  3 widths, including the interior wall, and 2 lengths less the 2 doors (-6 total)
replace y with 600/x  to get this in terms of x only
multiply by 100 to get the total cost