ciarra2006 ciarra2006
  • 17-04-2020
  • Mathematics
contestada

Find the value of y so that the points (-2,5) and (8y) lie on a line with the slope -1/5​

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altavistard
altavistard altavistard
  • 19-04-2020

Answer:

y = 3

Step-by-step explanation:

Use the slope formula:

        y2 - y1

m = ------------- ,     which here becomes

         x2 - x1

          y - 5          -1

m = -------------  = -----

        8 - (-2)          5

Solve this for x.  Cross multiplication yields:

5y - 25 = -1(10) = -10

Then 5y = 15, and y = 3

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