The points (-3, 12) and (-1, r) lie on a line with slope - 3. Find the missing coordinate r.

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Kelvin Barsana asked Aug 13, 2023

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The points (-3, 12) and (-1, r) lie on a line with slope - 3. Find the missing coordinate r.

Mathematics
college

Kelvin Barsana asked Aug 13, 2023

by Kelvin Barsana

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1 Answer

16 votes

Answer:

r = 6

Explanation:

(12-r) / ((-3-(-1)) = -3/1

(12-r)/(-2) = -3

cross-multiply:

12 - r = 6

subtract 12 from each side:

-r = -6

divide each side by -1:

r = 6

Daralyn answered Aug 20, 2023

by Daralyn

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