Question

The scatter plot with trend line below shows the data comparing wind speed and wind chill. Wind Chill (˚F) Wind Speed (mph) The trend line passes through (10, 9) and (35, 0). Write an equation for the trend line. The equation of the trend line is y = x + .

Answer 1

The trend line passes through (10, 9) and (35, 0) will be 9x + 25y = 315.

What is the equation of a line passing through two points?

Suppose the given points are (x₁, y₁) and (x₂, y₂), then the equation of the straight line joining both two points is given by

$\rm (y - y_1) = \dfrac{y_2 - y_1}{x_2 - x_1} (x -x_1)$

The scatter plot with the trend line below shows the data comparing wind speed and wind chill. Wind Chill (˚F) Wind Speed (mph). The trend line passes through (10, 9) and (35, 0).

Write an equation for the trend line.

(x₁, y₁) → (10, 9)

(x₂, y₂) → (35, 0)

Then we have

        y - 9 = -9/25(x - 10)

25y - 225 = -9x + 90

 9x + 25y = 315

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