SOLUTION: Hi Tutors can you please help me out the problem below. Much appreciated A line that includes the points (r,7)and (8,-5)has a slope of 6. What is the value of r? r=

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Question 1089668: Hi Tutors can you please help me out the problem below. Much appreciated
A line that includes the points (r,7)and (8,-5)has a slope of 6.
What is the value of r?
r=

Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
slope = (y2 - y1) / (x2 - x1)
:
6/1 = (-5 -7) / (8 -r)
:
cross multiply fractions
:
6(8-r) = (-5 -7)
:
48 -6r = -12
:
-6r = -60
:
r = 10
:

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