2x+y=−8x−y=−4{2x+y=−8x−y=−4

(−1, 3)(−1, 3)

(−4, 0)(−4, 0)

(−3, −2)(−3, −2)

(1, 5)

answer; /// i believe that the correct answer is ( monophasic ); ethinyl estradiol- ethynodiol diacetate is a monophasic oral contraceptive agent; ///

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.