Hey there!
In order to figure this out, we can set up an equation using our slope given two points formula. We can set this equal to -7 as our slope has to equal this.
y2-y1/x2-x1 = -7
Plug in values:
-5-y/-3-(-4) = -7
Simplify
-5-y/-3 + 4 = -7
-5 - y/ 1 = - 7
-5 - y = -7
-y = -2
y = 2
Now, we can plug it back in to see if it works:
-5-2/-3-(-4) =
-7/-3-(-4) =
-7/-3+4 =
-7/1 =
-7
It works, so your value is D, 2. You're likely getting 12 or -12 because of issues with adding or subtracting, especially with the negatives, in this equation.
Hope this helps!