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Sagot :
Answer:
r = 4
Step-by-step explanation:
You need to use the slope formula to solve for r.
1. Write out the equation using slope formula
(-7 - 1)/(r + 4) = -1
2. Multiply both sides by r + 4
-8 = -r - 4
3. Add 4 on both sides. Optionally, use the reflexive property of equality.
-r = -4
4. Multiply both sides by -1
r = 4
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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