Answer:
[tex]\boxed {y + 1 = -2(x - 3)}[/tex]
Step-by-step explanation:
Since you already have both the slope and the first point, use the Point-Slope formula and make it in point-slope form:
[tex]y - y_{1} = m(x - x_{1})[/tex]
Slope: [tex]m[/tex]
First Point: [tex](x_{1}, y_{1})[/tex]
-Apply the given slope and first point:
Slope: [tex]-2[/tex]
First Point: [tex](3, -1)[/tex]
[tex]\boxed {y + 1 = -2(x - 3)}[/tex]