1) Find - given y? = x. dx 2) Find the tangent line to y? = x at the point (4, -2). 3) Findy given 3xy - In x. dx 4) Find - for the circle defined by the equation x ? + y? = 18. 5) The circle defined by the equation x"+ y = 18 has two points where the slope of its tangent line is m = 1. Find those points. (Hint: One technique is to solve a system of equations using the circle and slope equations.)