Question 670139
Starting with
-3x - 4y  = 9
...
4y= - 3x - 9 
{{{y = (3/4)x - (9/4)}}}
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The slope is {{{3/4}}}
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A parallel line has the same slope of {{{3/4}}}.
A perpendicular line has the negative reciprocal slope of {{{-4/3}}}
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