Answer
a)
Work Step by Step
The line crosses the y-axis at $y=-1$ so $b=-1$.
Thus, our equation is $y=mx-1.$
Use the point $(-2,0)$ to substitute into the equation to obtain:
$y=mx-1\\0=m(-2)-1\\1=-2m\\-0.5=m$
Thus the equation is: $y=-0.5x-1$, thus the answer is a)
