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x+y=15 _____(1)
x-y=4 _____(2)
By solving equations 2, we get
x-y=4
X=4+y ______(3)
By putting equation 3 in equation 1, we get
x+y=15
(4+y)+y=15
4+2y=15
2y=15-4
2y=11
y=11/2
By putting this value of Y in equation 2, we get
x-y=4
2x-11=4×2
2x-11=8
2x=8+11
X=19/2
I hope this will help you friend.
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