SOLUTION: Find the smallest angle between the lines 2x + y = 0 and x + 3y + 4 = 0

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Question 948934: Find the smallest angle between the lines 2x + y = 0 and
x + 3y + 4 = 0

Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
Find the angle each line makes with the x-axis.



Slope is change in y over change in x.
So then the angle is,



.
.
.






Now find the difference between the two angles, that's the angle between them,




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