Question

help

Answer 1

x+y=12
x-y=4

Answer 2

Let the numbers be x and y
therefore
x+y= 12
and
x-y=4
adding the two equations we have

x+y + x-y= 12+4
2x= 16
x= 8

substituting x= 8 in x+y= 12 we find
x+y= 12
y=12-8
y= 4
hence x= 8 and y= 4 are the required numbers..

Answer 3

verification
8+4= 12

and

8-4 = 4