SOLUTION: if m= -2/7 and is the slope thru (-8,r) and (4,3) what is r?

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Question 710907: if m= -2/7 and is the slope thru (-8,r) and (4,3) what is r?
Answer by lwsshak3(11628) About Me  (Show Source):
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if m= -2/7 and is the slope thru (-8,r) and (4,3) what is r?
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slope=∆y/∆x=(y1-y2)/(x1-x2)
=(3-r)/(4-(-8))
=(3-r)/(4+8)
=(3-r)/12=-2/7
21-7r=-24
7r=45
r=45/7