4. Submitz'able. Preferences 2 are strictly convex if, for any two bundles x i y, x z y and 0 y. Is the preference represented by the utility u(x1, x2) = x1 + x2 strictly convex? Show that when a consumer has strictly convex and complete preferences there can be at most one bundle in d (p, I ), where I is the consumer's income and p are the prices for goods