y= 5(x+4)
y= 5x+ 20
from the equation you know that slope of the given line m1= 5
parallel lines have equal slopes so m1=m2=5
and you have a point given
You can write the equation using point slope form
y-y1 = m(x -x1) where m is the slope and (x1,y1) is the given point
Then distribute m, rearrange the constants, so you have only y term on the left hand side of the equation
That would be equation in slope intercept form
y = mx+ b
Hope this helps