Solve for a
a=-\frac{3b}{4}
Solve for b
b=-\frac{4a}{3}
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12a=-9b
Subtract 9b from both sides. Anything subtracted from zero gives its negation.
\frac{12a}{12}=-\frac{9b}{12}
Divide both sides by 12.
a=-\frac{9b}{12}
Dividing by 12 undoes the multiplication by 12.
a=-\frac{3b}{4}
Divide -9b by 12.
9b=-12a
Subtract 12a from both sides. Anything subtracted from zero gives its negation.
\frac{9b}{9}=-\frac{12a}{9}
Divide both sides by 9.
b=-\frac{12a}{9}
Dividing by 9 undoes the multiplication by 9.
b=-\frac{4a}{3}
Divide -12a by 9.
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