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Explain why there is sometimes only one solution to a problem

Lesson 4 / 10

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I can explain why there is sometimes only one solution to a problem.

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Some problems with two unknowns have only one solution. If both the sum of and difference between the two unknowns are known then there will only be one solution. Some problems with two unknowns have many solutions. Some problems with two unknowns have an infinite number of solutions.

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