Question 1140328
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The equation of this line in the slope-intercept form is 


    y = -x + 6.


The coefficient at "x" is -1.  Therefore, the slope of the line is -1.
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Answered and solved.


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P.S.  In this forum, we do not write "vertically".


We read and write "horizontally", which means "in horizontal lines".


Please and thank you.