View Full Version : inequalities: the width of a rectangle is 6 cm more than....
jehan.the.great
05-30-2006, 07:57 PM
"the width of a rectangle is 6 cm. more than one half the length and the perimeter is at most 72 cm. Find the maximum dimentions of the rectangle. (let x = the length of the rectangle)"
so far i got
2x + 2(1/2 + 6)<72
x20
but im clueless about the rest.
stapel
05-30-2006, 08:02 PM
If "x" is the length, then the only way "6 + 1/2" could be the width is if x = 1. Is this given somewhere in the exercise?
Also, what does "x20" mean?
Thank you.
Eliz.
jehan.the.great
05-30-2006, 08:26 PM
ooo sorry i meant
x<20
skeeter
05-31-2006, 10:15 AM
the width of a rectangle is 6 cm. more than one half the length and the perimeter is at most 72 cm. Find the maximum dimentions of the rectangle. (let x = the length of the rectangle)
you are correct, the rectangle's length has to be less than or equal to 20
w = 6 + (x/2)
2w = 12 + x
2w - 12 = x
since x < 20, 2w - 12 < 20
find the range of values for the width, w.
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