Solve for b
b=\frac{a-50}{4}
Solve for a
a=4b+50
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-4b=50-a
Subtract a from both sides.
\frac{-4b}{-4}=\frac{50-a}{-4}
Divide both sides by -4.
b=\frac{50-a}{-4}
Dividing by -4 undoes the multiplication by -4.
b=\frac{a}{4}-\frac{25}{2}
Divide 50-a by -4.
a=50+4b
Add 4b to both sides.
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