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tensa zangetsu [6.8K]
3 years ago
15

Which of these points lies on the line described by the equation below? y - 4 = -2(x - 6)

Mathematics
1 answer:
ch4aika [34]3 years ago
3 0
Y - y₁ = m(x - x₁)
 y - 4 = -2(x - 6)
 y - 4 = -2(x) + 2(6)
 y - 4 = -2x + 12
   + 4          +   4
      y = -2x + 16

The answer is D, (6, 4).
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A pilot can travel 450 miles with the wind in the same amount of time as 360 miles against the wind. Find the speed of the wind
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Given:

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Let the speed of wind be x miles per hour.

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We know that,

Time=\dfrac{Distance}{Speed}

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\dfrac{450}{315+x}=\dfrac{360}{315-x}

Divide both sides by 90.

\dfrac{5}{315+x}=\dfrac{4}{315-x}

By cross multiplication, we get

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\dfrac{(1)315}{9}=x

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