The perimeter of a rectangular book is 48 inches. How do you express the length of the book as a function of the width?
1 Answer
May 28, 2016
Explanation:
Recall that the perimeter of a rectangle is given by,
color(blue)(|bar(ul(color(white)(a/a)P=2(l+w)color(white)(a/a)|))) where:
P= perimeter
l= length
w= width
Hence, to create an expression for the length, substitute
P=2(l+w)
48=2(l+w)
48/2=l+w
l=24-w
Replacing
color(green)(|bar(ul(color(white)(a/a)color(black)(f(w)=-w+24)color(white)(a/a)|)))