Question

the area of the rectangle is 85 cm. express the perimeter of the rectangle is function of the width x.

Answer 1

$the \ width : \ x \\ the \ length : \ y \\ The area : \ A=85 \\ \\A=xy \\ \\85=xy\\ \\y= \frac{85}{x}$

Answer 2

F(x)=85-2(y)  I think it is so .