Solve for x
x=\frac{25-y^{2}}{9}
Solve for y (complex solution)
y=-\sqrt{25-9x}
y=\sqrt{25-9x}
Solve for y
y=\sqrt{25-9x}
y=-\sqrt{25-9x}\text{, }x\leq \frac{25}{9}
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25=9x+y^{2}
Add 7 and 18 to get 25.
9x+y^{2}=25
Swap sides so that all variable terms are on the left hand side.
9x=25-y^{2}
Subtract y^{2} from both sides.
\frac{9x}{9}=\frac{25-y^{2}}{9}
Divide both sides by 9.
x=\frac{25-y^{2}}{9}
Dividing by 9 undoes the multiplication by 9.
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