Solve for X
X=-\frac{Y}{7}+3
Solve for Y
Y=21-7X
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-7X+21=Y
Add Y to both sides. Anything plus zero gives itself.
-7X=Y-21
Subtract 21 from both sides.
\frac{-7X}{-7}=\frac{Y-21}{-7}
Divide both sides by -7.
X=\frac{Y-21}{-7}
Dividing by -7 undoes the multiplication by -7.
X=-\frac{Y}{7}+3
Divide Y-21 by -7.
-Y+21=7X
Add 7X to both sides. Anything plus zero gives itself.
-Y=7X-21
Subtract 21 from both sides.
\frac{-Y}{-1}=\frac{7X-21}{-1}
Divide both sides by -1.
Y=\frac{7X-21}{-1}
Dividing by -1 undoes the multiplication by -1.
Y=21-7X
Divide -21+7X by -1.
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