Option A (y=-2x-3) is the answer.
Explanation:
First, you need to multiply the -2 by what is in the parentheses, in order to expand the equation. -2*x is -2x, and -2*4 is -8. This leaves you with -2x-8 on the right side of the equation.
Next, you need to isolate y on the left side of the equation. You can do this by subtracting -5 from both sides. Subtracting a negative causes it to become positive, so you are really just adding 5 to both sides.
This makes it so the y is now alone, and the right side has -2x-8+5. We add together the -8 and 5 to leave us with -3.
This makes the answer y=-2x-3.