35. a pilot can travel 400 miles with the win
amount of time as 336 miles against the wind. find
of the wind if the pilot's speed in still air is 230 mi
hour.
the wind in the same
ind. find the speed
is 230 miles per

The wind speed is 20 miles per hour.

Step-by-step explanation:

Speed = distance/time.

With the wind

230 + w = 400 / t   where w is the speed of the wind.

Against the wind:

230 - w = 336/t

From the above equations:

t = 400/ (230 + w)

t = 336/ (230 - w)  So:

400/ (230 + w) = 336/ (230 - w)

336(230 + w) =  400(230 - w)

77280 + 336w = 92000 - 400w

736w =  92000 - 77280 = 14720

w =  14720 / 736

w = 20.

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)