Let the length of the rectangle be a.
Let the width of the rectangle be (6+b) units.
½(2a-4)(6+b)-70 = ½(6a)+½(a-4)b
12a+2ab-24-4b-140 = 6a+ab-4b
6a+ab = 164
Therefore;
a(6+b) = 164
Notice.
a is the length of the rectangle.
(6+b) is the width of the rectangle.
Therefore;
Length*Width = a(6+b) = 164
It implies;
Area Rectangle = 164 cm²
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