We are given the slope of the line and a point that it passes through.
We can use the Point-Slope Formula:
Where
y1 stands for y-coordinate of the point
m stands for the slope of the line
x1 stands for the x-coordinate of the point
Plug in the values and solve:
y-(-4)=-3(x-(-1)
y+4=-3(x+1)
y+4=-3x-3
y=-3x-3-4
y=-3x-7
Hope it helps!