Solve for y, z, k (complex solution)
y=-3z\text{, }z\in \mathrm{C}\text{, }k=-\frac{2}{3}\approx -0.666666667
y=0\text{, }z=0\text{, }k\in \mathrm{C}
Solve for y, z, k
y=-3z\text{, }z\in \mathrm{R}\text{, }k=-\frac{2}{3}\approx -0.666666667
y=0\text{, }z=0\text{, }k\neq -\frac{2}{3}
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