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line k has a slope of -3 and contains the point (4,-6). which equation describes line k?; if \frac{2n}{5}=10 5 2n =10, then what is the value of 2n - 1?; which ordered pair is a solution to the following linear system? 5x + 4y = –14 x + 2y = 2; a plumber charges $50 to make a house call; desmos; you are renting a car that charges a $30 fee plus 40 cents a mile. the rate of change is $30.