Respuesta :

hello : 
x : the lenghe    y : the width
x-6 = 2y....(1)
xy=140....(2)
by (1) : x= 6+2y
subsct in (2) :  (6+2y)y =140
2y² +6y -140 =0
y² +3y -70 = 0
delta : b²-4ac    a=1   b=3   c= -70
3²-4(1)(-70) = 289=17²
y1 = (-3-17)/2  negatif... refused
y2 = (-3+17)/2 = 7
x= 6+2(7) = 20

Dimensions of the rectangle is length l=14 meter and width w= 10 meter

What is Rectangle?

A rectangle is a quadrilateral with four right angles.

What is area?

Area is the quantity that expresses the extent of a region on the plane or on a curved surface

Given,

The length of a rectangle is 6 meter less than twice its width

Consider,

Length = l

width = w

Then,

l = 2w - 6

Area of the rectangle = 140 meter square

Area of the rectangle = Length × Width

140 = l×w

Substitute the value of l in the equation of area

140 = (2w-6)×w

[tex]2w^{2}-6w=140\\ 2w^{2}-6w-140=0\\w^{2} -3w-70=0\\(w-10)(w+7))=0[/tex]

Therefore width w = 10 and -7

Width cannot become negative

Therefore width w = 10 meter

Substitute the value of w in the equation of area

140= l × 10

l=[tex]\frac{140}{10}=14[/tex]

Length l= 14 meter

Hence, the dimensions of the rectangle is l=14 meter and w=10 meter

Learn more about rectangle and area here

https://brainly.com/question/20693059

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