x + y = 25
x - y = 15
x = 15 + y
15 + y + y = 25
2y = 25-15
2y = 10
y = 5
= 15 + 5
= 20
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x + y = 25
x - y = 15
x = 15 + y
x + y = 25
15 + y + y = 25
2y = 25-15
2y = 10
y = 5
x = 15 + y
= 15 + 5
= 20