(x+y)*2=20 |:2
(x-y)*2,5=20 |:2,5
(x+y)=10
x-y = 8
y= 10-x
x-(10-x)=8
x+x-10=8
2x=18
x=9
y=10-x
y=10-9=1
y=1
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(x+y)=10
x-y = 8
y= 10-x
x-(10-x)=8
x+x-10=8
2x=18
x=9
y=10-x
y=10-9=1
x=9
y=1