Question:
Find the vector equation of the plane through the intersection of the planes $\overrightarrow{\mathrm{r}} \cdot(\hat{\mathrm{i}}+3 \hat{\mathrm{j}}-\hat{\mathrm{k}})=0$ and $\overrightarrow{\mathrm{r}} \cdot(\hat{\mathrm{j}}+2 \hat{\mathrm{k}})=0$. and passing through the point $(2,1,-1)$
Solution:
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