2. Draw the indifference curves for the following bivariate utility functions (for q1, 92 > 0): (a) u(q1, q2) = qiq2, where a + B 0 for all i). . Linear utility: u(x1, X2) = Ax1 + Bx2, where A and B are positive constants. . Often referred to "perfect substitutes" in the context of consumer theory (more later). . Cobb-Douglas utility: u(x1, x2) = xfx2, where a, B