Parallel lines have equal slopes. Your given equation is in slope-intercept form already, so the slope of the line represented by the given equation and the slope of all lines parallel to that line is simply the coefficient on the term.
You can put this solution on YOUR website! If the line is || to this one, it has the same slope or gradient, which in this case is 4 (from the 4x)
the +2 is the y=intercept and any number can go in here to produce a line || to the original.
So y=4x + 10 or y= 4x - 5 will do