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Let line $l_1$ be the graph of $5x + 8y = -9$. Line $l_2$ is perpendicular to line $l_1$ and passes through the point $(10,10)$. If line $l_2$ is the graph of the equation $y=mx +b$, then find $m+b$.

 

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 Mar 1, 2020
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m + b = 3 + 5 = 8.

 Mar 3, 2020

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