Solve for b
b=3-3k
Solve for k
k=-\frac{b}{3}+1
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3k+b=3
Swap sides so that all variable terms are on the left hand side.
b=3-3k
Subtract 3k from both sides.
3k+b=3
Swap sides so that all variable terms are on the left hand side.
3k=3-b
Subtract b from both sides.
\frac{3k}{3}=\frac{3-b}{3}
Divide both sides by 3.
k=\frac{3-b}{3}
Dividing by 3 undoes the multiplication by 3.
k=-\frac{b}{3}+1
Divide 3-b by 3.
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