To become parallel, equations need to have the same slope for the x-axis. To do that, let's convert the equation to Slope Intercept Form.
2x + y = -5
Subtract y from both sides
2x = -y - 5
Divide both sides by 2.
x = -1/2y - 5/2
The slope is -1/2. Knowing this, we can make this equation.
x = -1/2y + 2
Now, we have to convert that into Standard Form.
x = -1/2y + 2
Add 1/2y to both sides.
x + 1/2y = 2
Multiply everything by 2.
2x + y = 4