Mason has 6 more marbles than Kasie has. Write an algebraic expression that represents the amount of marbles that Mason has
1 answer:
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(Notice that we always have and
, then solve for
:
(this is the inverse)
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This inverse is valid only for . Why?
Suppose we take . Then
This would suggest that in the original equation, we should get when
. But when we check this, we end up with
which is clearly not true.