Find the angle ? between two nonvertical lines  and . The angle ? satisfies the equation  

?

?
where  and  are slopes of  and , respectively.
(Assume that .)
?
: 5x - 4y = 5
: x + y = 1
?
Round your answer to one decimal place.
?

A. 83.7º
B. 84.7º
C. 85.7º
D. 86.7º
E. 87.7º


Answer: A

Mathematics

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