Well it is 12-6 Proof:
12+6=18
18-6=12
Thats the answer 12-6
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Add the two equations together.
(x+x)+(y-y)=(18+6)
2x = 24
x = 12
Substituting back into equation 1: (12) + y = 18
y = 6
check:
12 + 6 = 18
12 - 6 = 6
It checks. ■
10 and 8
18 & 42
The numbers are 18 and 12
18 and 12
The numbers are 18 and -17 because 18-(-17) = 35 and 18+(-17) = 1