Solve for x
x=\frac{680-7y}{3}
Solve for y
y=\frac{680-3x}{7}
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15x=3400-35y
Subtract 35y from both sides.
\frac{15x}{15}=\frac{3400-35y}{15}
Divide both sides by 15.
x=\frac{3400-35y}{15}
Dividing by 15 undoes the multiplication by 15.
x=\frac{680-7y}{3}
Divide 3400-35y by 15.
35y=3400-15x
Subtract 15x from both sides.
\frac{35y}{35}=\frac{3400-15x}{35}
Divide both sides by 35.
y=\frac{3400-15x}{35}
Dividing by 35 undoes the multiplication by 35.
y=\frac{680-3x}{7}
Divide 3400-15x by 35.
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