Answer
$y=-14x+21$
Work Step by Step
$(1,7)$ and $(2, -7)$
$m=\frac{-7-7}{2-1}$
$m=-14$
$(y-y_1)=m(x-x_1)$
$(y-7)=(-14)(x-1)$
$y-7=-14x+14$
$y=-14x+21$
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