The original perimeter is 32ft. The dimensions of the new rectangle are 72 ft wide and 24 ft long. The new perimeter is 192 ft. When the dimensions are multiplied by 6, the perimeter also multiplied by 6.
Anytime there is a vertical line, the y value becomes infinite as the line goes on forever. The only restriction on the line is on the x value of your coordinate. The same goes for a horizontal line, only the x value would become infinite and the y value would be constant.