Please answer! Which systems of equations would have no solution?

A. X + y = 4 and y = -x+4

B. Y= 3x + 2 and y= 3x - 2

C. 2x + y = 10 and y= -2x + 10

D. 3x + y = 8 and 3x + y = 9

In one day there are too high tides into low tides and equally spaced intervals the high tide is observed to be 6 feet above the average sea level after six hours passed a low tide occurs at 6 feet below the average sea level in this task you will model this occurrence using a trigonometric function by using x as a measurement of time assume the first high tide occurs at x=0. a. what are the independent and dependent variables? b. determine these key features of the function that models the tide: 1.amplitude 2.period 3.frequency 4.midline 5.vertical shift 6.phase shift c. create a trigonometric function that models the ocean tide for a period of 12 hours. d.what is the height of the tide after 93 hours?