What is the equation of the normal to the parabola x2=4yx^2 = 4yx2=4y at the point (4,4)(4, 4)(4,4)?
x+y=8x + y = 8x+y=8
x−y=0x - y = 0x−y=0
x+y=4x + y = 4x+y=4
x+2y=12x + 2y = 12x+2y=12