Hello Ayah,
If two lines are parallel, that means they have the same slope. To find the slope of the line given, we must move the components around until y is on one side of the equation.
x + 2y = 4
⇓
y = (-1/2)x + 2
The slope is the number in front of x. In this case, the slope is -1/2. In order to create an equation for a parallel line that passes through (0,5), we must use the point-slope form of a linear equation.
y - y1 = m(x - x1)
x1 and y1 are the coordinates of the point we want the line to pass through, and m is the slope. We need to plug these values into the equation to get our answer.
y - 5 = (-1/2)(x - 0)
⇓
y = (-1/2)x + 5
I hope this helps!
