Need help with a problem

1.5a=b -----> I

b=1/a------->II

Substitute for b

1.5a=1/a

1.5a-(1/a)=0

Multiply both sides by (a)

(1.5a²)-1=0

1.5a²=1

a²=1/1.5

a= sqrt(1/1.5)

a=sqrt(2/3)

a=0.816497

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ab=1

b=1/a

b=1/(sqrt(2/3))

b=1.224745