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1. x - y = 9

2. x + y = 18

Adding 1. & 2. gives:

3. 2x = 27

x = 27/2

x = 13.5

Substituting x = 13.5 into 1. gives:

13.5 - y = 9

y = 13.5 - 9

y = 4.5

The two numbers are therefore 13.5 & 4.5.

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13y ago

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