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Step-by-step explanation:
in a rectangle opposite sides are equal
so x+4=2y
2x+y+8=4x-y
x+4=2y
x-2y=-4---(1)
2x+y+8=4x-y
2x+2y=8
from (1)
x+x-2y=8
x-4=8
x=12
from (1)
x-2y=-4
-2y=-16
y=8
b=2y=x+4=16
l=4x-y=2x+y+8=40
perimeter of rectangle=2(l+b)
=2(40+16)
2(56)=112
area =l*b
=(40)(16)
=640
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