SOLUTION: A book case is to be constructed. The height is 4 feet longer than the length of a shelf. If 20 feet of lumber is available for the entire unit,except the back, find the length an

Question 294737: A book case is to be constructed. The height is 4 feet longer than the length of a shelf. If 20 feet of lumber is available for the entire unit,except the back, find the length and height of the unit.
The book case to be constructed consist of 4 horizontal lines and
the two vertical lines. I am stuck on a formula to use for this.

Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
shelf length is x, so height is x+4

4x + [2(x+4)] = 20

6x + 8 = 20
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