The length of a rectangle is 3 times the width. The area is 48 square feet. Find the length and width of the rectangle. x = width 3x = length {length is 3 times the width} Area of a rectangle = length x width x(3x) = 48 {substituted length and width into area formula} 3x² = 48 {multiplied} x² = 16 {divided each side by 3} x = 4 or 4 {took square root of each side} x = 4 {width cannot be negative} 3x = 12 {substituted 4, in for x, into 3x} width = 4 ft length = 12 ft  Algebra House
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