Find the smallest angle between the lines 2x+y-8=0 and x+3y+4=0

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter9: Real Numbers And Right Triangles
Section9.5: The Distance And Midpoint Formulas
Problem 3C
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Find the smallest angle between the lines 2x+y-8=0 and x+3y+4=0

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