SOLUTION: find the value of k if line AB has a slope of -2, when A(-2,-5) and B(k,7)?

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Question 520903: find the value of k if line AB has a slope of -2, when A(-2,-5) and B(k,7)?
Answer by lwsshak3(11628) About Me  (Show Source):
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find the value of k if line AB has a slope of -2, when A(-2,-5) and B(k,7)?
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slope=m=-2=∆y/∆x=(y1-y2)/(x1-x2)=(7+5)/(k+2)
-2=12/(k+2)
-2k-4=12
-2k=16
k=-8