Homework Help: math inequalities please check

Posted by Sandi on Monday, October 25, 2010 at 8:23pm.

A landscape designer has to design a rectangular pad of concrete at the centre of a rock garden. The lenght must be less than or equal to twice the width; the perimeter must be less than or equal to 40 m; and the area must be greater than or equal to 60 m².

1.)Write as system of inequalities to represent the constraints in this problem situation.

x=width y=length
y<=2x
2(x+y)<=40
xy>=60

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