SOLUTION: the length of a rectangle is 7 cm less than three times its width. its area is 20 square centimeters. Please help me find the dimensions of the rectangle.

Question 1131620: the length of a rectangle is 7 cm less than three times its width. its area is 20 square centimeters. Please help me find the dimensions of the rectangle.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
let the length be and te width
if the length of a rectangle is than its , we have
........eq.1

if its area is , we have
........substitute from eq.1

........factor

solutions:
if =>
if =>=>-> disregard negative solution for the width

now find the length
........eq.1

so, and

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