Solution
= Solution
This is the affine plane through $b,d,f$, provided $d-b$ and $f-b$ are independent. The <scalars> $\lambda,\mu$ are affine coordinates in those two directions.
= Solution
This is the affine plane through $b,d,f$, provided $d-b$ and $f-b$ are independent. The <scalars> $\lambda,\mu$ are affine coordinates in those two directions.