Verified Answer :

K=9ab+4a
A=k/9b+4
B=-4/9 + k/9a

apologiabiology

so try to isolate a by division and such
K=4a+9ab
we use reverse dstributive which is ab+ac=a(b+c) so
undistribute a
4a+9ab=a(4+9b)
k=a(4+9b)
divide both sides by (4+9b)
\(\frac{k}{4+9b}\)=a
a=\(\frac{k}{4+9b}\)

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