Answer:
<h2>A. y + 9 = -2(x - 10)</h2>
Step-by-step explanation:
The point-slope form of an equation of a line:

<em>m</em><em> - slope</em>
<em>(x₁, y₁)</em><em> - point on a line</em>
<em />
We have the slope <em>m = -2</em>, and the point <em>(10, -9)</em>.
Substitute:
