Write an equation for the line that passes through the points (0, -2) and (-4, 0). a: y = -2 x - 4 b: y = -2 x - 2 c: y = - 1/2 x - 2 d: y = - 1/2 x - 4 (plz answer quick.)

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)