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, but as he gets tired his speed decreases (at a rate of 1 mile per hour, every hour). Which equation represents the speed of the boat for x hours spent rowing?
y = x + 4
y = x − 4
y = 4 − x
y = 6 − x
y = 6 − 2x

Question

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, but as he gets tired his speed decreases (at a rate of 1 mile per hour, every hour). Which equation represents the speed of the boat for x hours spent rowing?
y = x + 4
y = x − 4
y = 4 − x
y = 6 − x
y = 6 − 2x

triciaal · Answer

i would choose y = 6-x
for the first hour he did 6 miles before he got tired|dw:1402683663813:dw|
rate is -1/hour for x hours = -x
y = mx + b
y = -x + 6
answer choice rearranged