2x - 4y = 1
-4y = -2x + 1
4y = 2x - 1
$y = \frac {1}{2}x - \frac{1}{4}$
$tan \theta = \frac{1}{2}$
$\theta = 26.57^o$
raphael answered the question on January 9, 2017 at 14:11
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