prosta linia in English:

So, even a straight line, defined with calculus, is a curve.

The kids made a beeline for the TV.

As soon as work is over, he makes a beeline for the pub.

Make a beeline for Mike. He is looking forward to you. At parties he always makes a beeline for the prettiest woman in the room.

If you want to go there in time, you'd better make a bee-line for your class right away.