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Explanation:
x^2 -y^2 = 25
x/y = 3/2 or x = 3/2 y <=====sub into first equation
(3/2 y)^2 - y^2 = 25
9/4 y^2 - y^2 = 25
5/4 y^2 = 25
y^2 = 25 (4/5) = 20
y = sqrt (20) = 2 sqrt 5
then x = 3/2 y = 3 sqrt5
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