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The points (2,-20) and (r,-5) lie on a line with slope 5/4. Find the missing coordinate r.

User Iarroyo
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2 Answers

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I took a picture because it may be a little difficult to understand if I wrote it in text. Hope this helps.

The points (2,-20) and (r,-5) lie on a line with slope 5/4. Find the missing coordinate-example-1
User Dave Smits
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7.7k points
6 votes

Answer: 14

Explanation:

The formula for slope in this problem is:


(-5-(-20))/(r-2)=(5)/(4)


(15)/(r-2) = (5)/(4) (cross multiply)

60 = 5(r-2)

60 = 5r - 10

70 = 5r

14 = r

Check: (2, -20) (14, -5)


(-5-(-20))/(14-2)


(15)/(12)


(5)/(4)

User Ekhanna
by
7.7k points

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