# A geometry problem by Darius B

Geometry Level 2

Given are two linear functions $$f(x)={ m }_{ f }⋅x$$ and $$g(x)={ m }_{ g }⋅x$$ with $${ m }_{ f },{ m }_{ g }\in ℝ\setminus \left\{ 0 \right\}$$. The lines $$f(x)$$ and $$g(x)$$ are perpendicular to each other on their graph. Find the value of $${ m }_{ f }⋅{ m }_{ g }$$

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