Solve for a
a=b+2
Solve for b
b=a-2
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2a+2b-4a=-4
Subtract 4a from both sides.
-2a+2b=-4
Combine 2a and -4a to get -2a.
-2a=-4-2b
Subtract 2b from both sides.
-2a=-2b-4
The equation is in standard form.
\frac{-2a}{-2}=\frac{-2b-4}{-2}
Divide both sides by -2.
a=\frac{-2b-4}{-2}
Dividing by -2 undoes the multiplication by -2.
a=b+2
Divide -4-2b by -2.
2b=4a-4-2a
Subtract 2a from both sides.
2b=2a-4
Combine 4a and -2a to get 2a.
\frac{2b}{2}=\frac{2a-4}{2}
Divide both sides by 2.
b=\frac{2a-4}{2}
Dividing by 2 undoes the multiplication by 2.
b=a-2
Divide -4+2a by 2.
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