This table gives a few (x, y) pairs of a line in the coordinate plane. X
-56
-42
-28
Y
66
58
50

What is the y-intercept of the line?

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