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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[8] and [10].
They are 10 and 8
8 and 10
13 and 5
Jeez that's easy 12 and 18