Given:
To find:
The obtuse angle between the given pair of straight lines.
Solution:
The slope intercept form of a line is
...(i)
where, m is slope and b is y-intercept.
The given equations are
On comparing these equations with (i), we get
Angle between two lines whose slopes are 
is
Putting and , we get
Now,
and 
and 
and 
, so it is an obtuse angle and 
, so it is an acute angle.
Therefore, the obtuse angle between the given pair of straight lines is 120°.
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The answer would be 12/54 (twelve fifty fourths) but if you simplify it you would get 2/9 (two ninths).
(4 - 5y) - 2(3.5y - 8)
first distribute
(4- 5y) - 7y + 16
Then simplify
-12y + 20
Then simplify
4(-3y + 5)
hope this helps
