What is the angle between the positive horizontal axis and the line containing the points (2,3) and (9,7)?

What is the angle between the positive horizontal axis and the line containing the points (9,7) and (10,10)?

I do not understand how to find the line from the two points, and then the angle

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If you would plot these two points, you would notice a small right triangle is formed with the line connecting the points is the hypotenuse, a horizontal leg of =10-9=1, and a vertical leg of 10-7=3.

This gives the line a slope of 3/1=3 which is equal to the tangent of the angle which is equal to the angle you are trying to find.

Using a calculator,

arctan(3)=71.57 deg (ans)

Explanation:

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