1. Originally Posted by Hong Kong Chinese
Teacher Tdol,

You are correct! She/he is a liar!
One cannot solve an equation with two unknowns!
e.g. a + b = 10

if a is equal one, b will be equal to nine,
However, if a is equal to two, b will be equal to eight and so on.
In conclusion, a and b are variables.
artax is correct. :)

Originally Posted by artax
Summing a rational number (y) to an irrational one you always obtain an irrational number. So the only way y is rational is that a (of a/b, 'a' over 'b') is equal to b or an his multiple. for example ^5 or 2*^5
:)

2. Hong Kong Chinese Guest

## misunderstanding

I think that I have misunderstood the first reply of Teacher Tdol, which may probably be caused by our culture difference.

Though I almost forgot all the algebra formulas, as a rule, I still insist that:

One unknown in one equation
Two unknowns in two equations
Three unknowns in three equations

Those unknowns can be solved!

I normally don’t call myself a liar, but sometimes an imbecile.

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