Which best describes the relationship between the lines with equations 5x+y=4 and 20x+4y=16? A. same line
B. perpendicular
C. parallel
D. neither perpendicular nor parallel

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

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

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish