You can put this solution on YOUR website!
It has been many years since I have had any math, so I am really strugling.
Can you explain this for me, and how to solve it, I would be very greatful.
Does the line y=4 is a vertical line
It's a horizontal line. Actually, it's parallel to the x-axis, which is usually the horizontal axis.
You can see that if you graph it. Since it's a straight line, all you need are 2 points, then draw the line thru them.
You can use (0,4) and 4,4). You'll see that no matter what the value of x is, y is 4, so it's parallel to the x-axis.