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A student finds the slope of the line between (8, 17) and (1, 4). She writes[tex]17-4/1-8 What mistake did she make? A. She used y-values where she should have used x values. B. She mixed up the x- and y values. C. She did not keep the order of the points the same in the numerator and the denominator. D. She should have added the values, not subtracted them.

A student finds the slope of the line between (8, 17) and (1, 4). She writes[tex]17-4/1-8 What-example-1

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Answer:

C

Explanation:

Calculate the slope m using the slope formula

m =
(y_(2)-y_(1) )/(x_(2)-x_(1) )

with (x₁, y₁ ) = (1, 4) and (x₂, y₂ ) = (8, 17)

m =
(17-4)/(8-1) =
(13)/(7)

Instead of 8 - 1 on the denominator she had 1 - 8

She did not keep the order of the points the same in the numerator and the denominator.

User Frank Boyne
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