Solve for j
j=-\frac{u}{9}+\frac{4}{3}i
Solve for u
u=12i-9j
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12i-9j=u
Swap sides so that all variable terms are on the left hand side.
-9j=u-12i
Subtract 12i from both sides.
\frac{-9j}{-9}=\frac{u-12i}{-9}
Divide both sides by -9.
j=\frac{u-12i}{-9}
Dividing by -9 undoes the multiplication by -9.
j=-\frac{u}{9}+\frac{4}{3}i
Divide u-12i by -9.
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