SOLUTION: x+y=201 x-y=11 solve using substitution

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Question 817238: x+y=201
x-y=11 solve using substitution
Answer by lorst(1) About Me  (Show Source):
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x+y=201
x-y=11
let:x-y=11
x=11+y
solve for y:
x+y=201
11+y+y=201
2y=201-11
2y/2=190/2
y=95
solve for x:
x-y=11
x-95=11
x=11+95
x=106
check:
x+y=201
106+95=201
201=201 check

x-y=11
106-95=11
11=11 check