Can some one help me.

You can find the constant of proportionality by finding the ratio of

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

What is the value of x in the equation7x+2y=48 when y=3