linear equation of class-x

Asked by crama1965 | 25th May, 2010, 04:56: PM

Expert Answer:

Let L be the length and B be the breadth of the rectangle,

then, area is LB

(L - 5)(B + 2) = LB - 80

LB + 2L - 5B - 10 = LB - 80

2L - 5B = -70        

Multiply by 2,

4L - 10B = -140       .... (1)

Also,

(L + 10)(B - 5) = LB + 50

LB - 5L + 10B - 50 = LB + 50

 - 5L + 10B  = 100        ..... (2)

Add (1) and (2),

-L = - 40

L = 40 cm and therefore, B = (100 + 5x40)/10 = 30 cm.

Hence the length is 40 cm and breadth is 30 cm.

Regards,

Team,

TopperLearning.

 

Answered by  | 25th May, 2010, 06:03: PM

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