Find the value of two numbers if their sum is 12 and the difference is 4

x+y=12

x-y=4

x=y-4

y-4+y=12

2y-4=12

2y=16

y=8

x=8-4=8

8+4=12

 the 2 numbers are 8 & 4

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times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

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