Solve for k
\left\{\begin{matrix}k=-\frac{b^{2}-y}{x}\text{, }&x\neq 0\\k\in \mathrm{R}\text{, }&y=b^{2}\text{ and }x=0\end{matrix}\right.
Solve for b
b=\sqrt{y-kx}
b=-\sqrt{y-kx}\text{, }y\geq kx
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kx+b^{2}=y
Swap sides so that all variable terms are on the left hand side.
kx=y-b^{2}
Subtract b^{2} from both sides.
xk=y-b^{2}
The equation is in standard form.
\frac{xk}{x}=\frac{y-b^{2}}{x}
Divide both sides by x.
k=\frac{y-b^{2}}{x}
Dividing by x undoes the multiplication by x.
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