Answer:
7 and 21
Explanation:
x+y=28
xy=3x squared
y=28-x
x(28 - x) = 3x^2
28x - x^2 = 3x^2
4x^2 - 28x = 0
(0 is not a natural number)
4x - 28 = 0
x = 7
7 + y = 28
y = 28 - 7
y = 21
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