Parallel lines have the same slope, so the slope of this new line is 4.
In the form y=mx+b, m is the slope, so the slope of this new line is y=4x+b.
The x intercept is 4, which is the coordinate (4,0). So plug that in to get b:
0=4(4)+b
0=16+b
B=-16
So in total, the new line is y=4x-16.
