Answer:
Let
P and A be the perimeter and area of the rectangle respectively.
Given
:
=
+ 4 cm/minute ?.(1)
(a) P = 2x + 2y
(b)
= 2(?5) + 2(4) [Uasing
(1)]
Perimeter
of the rectangle decrease at 2 cm/minute.
(b) A = xy
= x (+ 4)+ y (?5) [Using
(1)]
= + 4x ? 5y.
Hence ara of the
rectangle increase at 2cm2/minute.
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