In addition to the applications that
soren.harward mentioned, linear algebra, together with
trigonometry are the key areas of
mathematics you have to have a solid knowledge of to be a
computer games developer. The game world and its objects in modern
3D games are made out of triangles, which are made of 3
vertices (points in 3D space) each.
Vertices are 3- or 4-dimensional vectors (x,y,z,w), while things such as object movement, camera rotations, and the
perspective projection that brings the 3D world to your 2D computer screen are
matrices. So basically, the
GPU on a modern
graphics card is a very fast linear algebra calculator that does nothing but billions of vector/matrix operations per second.