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The points (-5,21) and (1,r) lie on a line with the slope -3. Find the missing coordinate r.​
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The points (-5,21) and (1,r) lie on a line with the slope -3. Find the missing coordinate r.​

User Rez Moss
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1 Answer

5 votes
3

y = mx + b
Plug in (-5, 21) for the x and y and -3 for m
You would get 21 = (-3 • -5) + b
21 = 15 +b
B = 6
Plug in 1 for x
y = (-3 • 1) + 6
And you would get 3
User Kibernetik
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7.3k points
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