MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Write the equation in terms of a rotated x'y'-system using 0, the angle of rotation. Write the equation involving x' an in standard form. 13) xy +16 = 0; 0 = 450 13) y'2 x 12 x12 X A) - =1 32 32 B) y'2 =-32x' ay' = 1 D) 1 32 32 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Identify the equation without applying a rotation of axes. 14) 10x2 + 8 3xy + 2y2 - 41 =0 14) 0