SOLUTION: What is the slope of 3x+3y=9

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Question 486310: What is the slope of 3x+3y=9
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
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The slope-intercept form is y=mx%2Bb, where m is a slope
3x%2B3y=9
3y=-3x%2B9 divide by 3
y=-x%2B3
the slope is m=-1