Which of the following equations is not written in general form? 2y = 7x - 19
2x + 5y - 9 = 0
5y - 9 = 0

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm