linear-equations-in-one-variable

the length of a rectangle exceeds its breadth by 4 cm. if length and breadth are each increased by 3 cm, the area of the new rectangle will be 81 cm sqsq morthan that of the given rectangle. find the length and breadth of the given rectangle.

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1. If the width is x and the length y, then

y = x+4
(x+3)(y+3) = xy+81

Now just solve for x and y. If you expand the 2nd equation, you will see the xy drop out, leaving you with two linear equations in x and y.

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posted by Steve
2. or - using one variable, as your title suggests

width --- x
length --- x+4

new width = x+3
new length = x+7

(x+3)(x+7) - x(x+4) = 81
x^2 + 10x + 21 - x^2 - 4x = 81
6x = 60

etc

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posted by Reiny
3. oh, sure - read the topic carefully.

show-off.

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posted by Steve
4. length 14 cm breadth 10 cm

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posted by suraj

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