Posted by jerry on Monday, January 28, 2008 at 6:27am.
The slope of the line is 1, so a=1.
Since the slope of a line equals the tangent of the angle between the x-axis and the line, we find that:
tan(angle) = 1
So if we take the arctangent (which is the inverse of the tangent function) of 1, we find that the angle must equal 45°.
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