A boat travels 7 km upstream and 7 km back. The time for the round trip is 6 hrs. The speed of the stream is 3 km/hr. What is the speed of the boat in still water?

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Ответ:

sk9600930

13.10.2020

Mathematics

Step-by-step explanation:

Slope = $\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

9) Mark any two point on the line

(x₁ , y₁) = (3 , 3) ; (x₂, y₂) = (-4 ,1)

$Slope =\frac{1-3}{-4-3}\\\\=\frac{-2}{-7}\\\\=\frac{2}{7}$

10) (x₁ , y₁) = ( -7 , 6) ; (x₂, y₂) = (11 ,-4)

$Slope =\frac{-4-6}{11-[-7]}\\\\ =\frac{-4-6}{11+7}\\\\=\frac{-10}{18}\\\\=\frac{-5}{9}$

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