Solve for x
x=7-3y
Solve for y
y=\frac{7-x}{3}
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-x-3y=-7
Subtract 7 from both sides. Anything subtracted from zero gives its negation.
-x=-7+3y
Add 3y to both sides.
-x=3y-7
The equation is in standard form.
\frac{-x}{-1}=\frac{3y-7}{-1}
Divide both sides by -1.
x=\frac{3y-7}{-1}
Dividing by -1 undoes the multiplication by -1.
x=7-3y
Divide -7+3y by -1.
-x-3y=-7
Subtract 7 from both sides. Anything subtracted from zero gives its negation.
-3y=-7+x
Add x to both sides.
-3y=x-7
The equation is in standard form.
\frac{-3y}{-3}=\frac{x-7}{-3}
Divide both sides by -3.
y=\frac{x-7}{-3}
Dividing by -3 undoes the multiplication by -3.
y=\frac{7-x}{3}
Divide -7+x by -3.
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