###### Example3.1.12

Virginia is designing a rectangular garden. The garden's length must be \(4\) meters less than three times the width, and its perimeter must be \(40\) meters. Find the garden's length and width.

Virginia is designing a rectangular garden. The garden's length must be \(4\) meters less than three times the width, and its perimeter must be \(40\) meters. Find the garden's length and width.