The equations of the lines are
3x + y + 12 = 0 … (1)
x + 2y − 1 = 0 … (2)
Angles between two lines.
Let m1 and m2 be the slopes of these lines.
m1 = -3, m2
Let θ be the angle between the lines.
Hence, the acute angle between the lines is 45°
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