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DerKrebs [107]
3 years ago
8

Emma calculated the slope of the downhill hike to be -1/40 her work is shown below determine whether her calculation was correct

or incorrect and then explain why

Mathematics
1 answer:
Monica [59]3 years ago
4 0

The calculation is incorrect, because the slope is defined as

m_{AB} = \dfrac{y_A-y_B}{x_A-x_B}

So, Emma has inverted numerator and denominator: she has calculated the inverse of the slope.

The correct calculation would be

\dfrac{300-900}{180-165} = \dfrac{-600}{15} = -40

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The second sentence tells us

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Since you weren't given a specific method to use, you can use either the substitution method or the elimination(addition) method, whichever works best for you.

 

Since the 2nd equation has the X isolated, I'm going to isolate the X in the first equation,

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