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write the equation of the line, with the given properties,in slope intercept form.
slope = - 3 through  (3,8)

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[tex]y=mx+b[/tex]
m - slope

[tex]m=-3 \\ y=-3x+b \\ \\ (3,8) \\ y=8 \ for \ x=3 \\ \\ 8=-3 \cdot 3 + b \\ 8=-9+b \\ b=17 \\ \\ \underline{\underline{y=-3x+17}}[/tex]