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?
A) y = x + 4
B) y = x − 4
C) y = 4 − x
D) y = 6 − x
E) y = 6 − 2x

Answer 1

@julianassange

Answer 2

At least tell him why, otheriwse they can't learn.

Answer 3

I am kind of muddled to be honest. I'll be back probs.

Answer 4

Huh?

Answer 5

My guess is C, but not sure.

Reasoning:
6-2=4
4-x(x being the amount that he decreases.)

Answer 6

What so you think @shoplovepc? Do you think that I'm right?

Answer 7

@julianassange do you think I'm right

Answer 8

Actually, it is choice D, because they're not saying he started at 4 miles and then went decreasing in speed which was said in choice C, and we don't know his gradually decreasing speed at various times, so he starts off at 6 miles and then after every hour he decreases is the answer, thus choice D.

Answer 9

OK, I see where you're coming from. I just thought that the 6 mph he was going was being factored by the 2 mph that was going against him. @Dakotafox79 if you get an answer soon can you post it so we'll know who's right.

Answer 10

You're probably right @OrangeMaster

Answer 11

You were right @OrangeMaster thanks :D.

Answer 12

Cool, thanks for letting me know.

Answer 13

Aw dang. That question is something I need to freshen up on. Thanks for explaining it Orange!