The points (-4, 1) and (r. -7) lie on a line with slope - 1. Find the missing coordinate r.
2 answers:
Answer:
r = 4
Step-by-step explanation:
Using the point-slope form of the equation for a line, the line with slope -1 through point (-4, 1) is ...
y -1 = -1(x +4)
Substituting the second point, we have an equation for r:
-7 -1 = -1(r +4)
8 = r +4 . . . . . . . divide by -1
r = 4 . . . . . . . . subtract 4
The missing coordinate is 4. The second point is (4, -7).
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