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√(x+1)+ √(y-1) =5 (1)
x+y=13 (2)
sub (2) into (1)
√(x+1)+ √(12-x) =5
(x+1)+ (12-x) +2√[(x+1)(12-x)]=25
√[(x+1)(12-x)]=6
(x+1)(12-x)=36
-x^2+11x+12=36
x^2-11x+24=0
(x-8)(x-3)=0
x=8 or 3
from (2)
x=8, y=5
x=3, y=10
(x,y)=(8,5) or (3,10)
x+y=13 (2)
sub (2) into (1)
√(x+1)+ √(12-x) =5
(x+1)+ (12-x) +2√[(x+1)(12-x)]=25
√[(x+1)(12-x)]=6
(x+1)(12-x)=36
-x^2+11x+12=36
x^2-11x+24=0
(x-8)(x-3)=0
x=8 or 3
from (2)
x=8, y=5
x=3, y=10
(x,y)=(8,5) or (3,10)
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