How Do You Calculate the Slope of a Line with a 130-Degree Inclination?

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With a given inclination of a 130 degrees. and up in the left corner it says -1

I have no idea how to do this, any idea?
 
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Those are polar coordinates, if you do not know how to find the slope of a line using polar coordinates, try something else.
 
I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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