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→Basic Algebra: removed some nonsense
*x could be 10 and y could be 1.
*x could be 10 and y could be 1.
There are 12 such pairs. Negative numbers are not allowed in algebra because they do not represent countable quantities. For example, suppose the unknowns represent the number of sheep on two different fields. It does not make sense for one field to have 13 sheep and the other to have -2 sheep, because there is no such thing as a negative sheep.
There are 12 such pairs of positive integers, but an infinite number of solutions to this equation.
==Notes and references==
==Notes and references==