y=2x+4
this is in slope intercept format
y = Mx + b
M = slope = 2
b = y-intercept = 4 or point (0,4)
To graph start on the y-axis at (0,4) go up 2 and over to the right 1 this gives 2 points and you can graph the line.
the parallel line is y = 2(x + 3) or y = 2x + 6