>>21261995that is how you are supposed to isolate variables. i think in a math class you would more commonly see a word problem instead of some meme picture where you have to make the logical connection yourself. it would be similar to a question like
assume there are 4000km between new york and la. when the plane flies with the wind it takes 4 hours to fly from new york to la, and when the plane flies against the wind it takes 5 hours make the return trip. calculate the speed of the plane, and the speed of the wind.
going 4000 / (p + w) = 4
return 4000 / (p - w) = 5
4000 / 4 = 1000 => p + w = 1000
4000 / 5 = 800 => p - w = 800
now p + p = 2p, and w - w = 0
so now we are left with 2p = 1800
1800/2 = 900
p = 900
now plug p back into the top equation
1000 - 900 = 100
w = 100
the plane travels 900km/h and the wind travels 100km/h
