Question 992405
x+y=k
x-y=k
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Add and solve for "x":
2x = 2k
x = k
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Solve for "y"
k + y =k
y = 0
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Solution:  (k,0)
Cheers,
Stan H.
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the solution to the system shown is 
(0,k)
(2,2)
(k,0)