if the length of a rectangle is 4x-3y and its breadth is 5x+4y
FIND ITS PERIMETER FAST
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perimeter of rectangle = 2 ( l × b )
= 2 ( 4x + 5x + 4y - 3y )
= 2 ( 9x + 1y )
= 18x + 2y
therefore
18x + 2y = 0
x + y = 0- 18- 2
x + y = -20
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