Solve for a
a=-\frac{k}{4}+1
Solve for k
k=4-4a
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4a=4-k
Subtract k from both sides.
\frac{4a}{4}=\frac{4-k}{4}
Divide both sides by 4.
a=\frac{4-k}{4}
Dividing by 4 undoes the multiplication by 4.
a=-\frac{k}{4}+1
Divide 4-k by 4.
k=4-4a
Subtract 4a from both sides.
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