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System of equations:
x + y = 23
x - y = 7           

Add them together
2x = 30
x = 15

Now plug 15 into one of the equations:
15 + y = 23
y = 8

your two numbers are 15 and 8
apologiabiology
x+y=23 and
x-y=7
add

2x=30
divide 2
x=15

sub back
15-y=7
minus 15
-y=-8
y=8
da numbers are 8 and 15

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