Consider the spring model x\" 4x+1x3 = 0, where the linear part of the spring is repulsive rather than attractive (for a normal spring it is attractive). Rewrite this as a system of first-order equations in x and y = x'. x'= y' = Write down your system when you have it correct, for use in the next three problems. Then find all critical points and enter them below, in order of increasingx coordinate. '(X.Y)=(C].D): (x.y)=(C].C]); (x.y)=(C].C]); For reference for the next three problems, write down your critical points after you've gotten them all right