David is rowing a boat upstream. The river is flowing at a speed of 2 miles per hour. David starts rowing at a speed of 6 miles per hour, and his speed decreases at a rate of 1.5 miles per hour. Which equation gives the speed of the boat after David has rowed for x hours? A- y=4+1.5x B- y=4-1.5x C-y=6-1.5x
David is rowing a boat upstream, so the river is slowing him down. Thus, the net speed is 6 mph - 2 mph = 4 mph. Since David's speed decreases at a rate of 1.5 miles per hour, after x hours his speed y will be: y = 4 - 1.5 x
