Mathematics
What can be said regarding a straight line if its slope is negative?
Inclination, θ is an acute angle.
Inclination, θ is an obtuse angle.
Either the line is x-axis or it is parallel to the x-axis.
Either the line is y-axis or it is parallel to the y-axis.
Straight Line Eq
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Answer
If the slope is negative, then tan θ must be negative.
tan θ < 0
This happens only when the angle θ made with the positive x-axis is between 90° and 180°.
And angles between 90° and 180° are called obtuse angles.
Hence, option 2 is the correct option.
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