SOLUTION: The perimeter of a rectangle is 84 meters. The width measures 3 meters less than the length. Find the width of the rectangle

Question 1004508: The perimeter of a rectangle is 84 meters. The width measures 3 meters less than the length. Find the width of the rectangle
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

a + b = 42    (it is ).
a - b =  3.

where a and b are the length and the width respectively
Solve this system. You may use the substitution or the elimination method.

The solution is 

a = 22.5 units, b = 19.5 units.

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