Draw a straight line.

Mr. Sen lives in Kagoshima.

We practice natural farming without using chemical fertilizers.

I am interested in the history of the Shinsengumi.

The Shinsengumi were protecting Kyoto during the end of the Edo period.

This world continues to give rise to innumerable changes.

This eternally unchanging truth does not change even as the times change.

His batting eye is amazing.

He has expert knowledge.

Linear algebra is a branch of mathematics that studies the theory of vector spaces and linear transformations.