89x+91y = 449 , 91x+89y= 451by elimination
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Add both equations
180x+180y=900
180(x+y)=900
X+Y=900/180
X+Y=5---------- (1)
Subtract both equations
-2x+2y=-2
-2(x-y)=-2
X-y=1----------(2)
X+y=5---------(1)
(2)+(1)
2x=6
X=3
X+y=5
3+y=5
Y=2
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