Which systems of equations have no solutions? choose all answers that are correct. a) y=3 x=2 b) y=3 y=-4 c) y=4x-1 y=4x+5 d) y=2x y=-2x

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