# Math Help - Slope of the line

1. ## Slope of the line

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Q) Find the slope of the line which makes an angle of 60 degrees with the positive direction of Y - Axis.

My answer is: negative sqrt of 3
The text book answer is: negative 1/sqrt of 3

What might be the reason?

2. Originally Posted by saberteeth
,
Q) Find the slope of the line which makes an angle of 60 degrees with the positive direction of Y - Axis.

My answer is: negative sqrt of 3
The text book answer is: negative 1/sqrt of 3

What might be the reason?
It makes an angle of 30 degrees with the negative x-axis, that is, an angle of $\theta = 150^0$ with the positive x-axis. And $m = \tan \theta$ ....

3. Originally Posted by mr fantastic
It makes an angle of 30 degrees with the negative x-axis, that is, an angle of $\theta = 150^0$ with the positive x-axis. And $m = \tan \theta$ ....
Thanks!