Solve for r
r=\frac{2}{7}-s^{2}
Solve for s
s=\frac{\sqrt{14-49r}}{7}
s=-\frac{\sqrt{14-49r}}{7}\text{, }r\leq \frac{2}{7}
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7r=2-7s^{2}
Subtract 7s^{2} from both sides.
\frac{7r}{7}=\frac{2-7s^{2}}{7}
Divide both sides by 7.
r=\frac{2-7s^{2}}{7}
Dividing by 7 undoes the multiplication by 7.
r=\frac{2}{7}-s^{2}
Divide 2-7s^{2} by 7.
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