Date: Tue, 6 Oct 1998 16:24:37 -0600 (CST)
Who is asking: Student
The solution is always x=-1, y=2
In any of the pairs of equations that you have if you subtract the first from the second you get
x + y = 1 or x = 1 - y.
All of these equations have the pattern
ax + (a+1)y = a + 2
so substituting x = 1 - y into this equation gives
a(1-y) + (a+1)y = a+2
Hence y = 2 and since x + y = 1, x = -1.
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