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find parametric equation of a line with a slope of -2 and passes through (-10,-20)

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[tex]y- y_{0} =m(x- x_{0} ) \\ m= \frac{y_{1}- y_{0}}{x_{1}- x_{0} } \\ y-(-20)= (-2)(x-(-10)) \\ y+20=-2x-20 \\ y=-2x-40[/tex]

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