daniseely daniseely
  • 12-01-2018
  • Mathematics
contestada

write an equation of direct variation that includes the point (9,-12)

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madelynlove16ownabo madelynlove16ownabo
  • 12-01-2018
Since it must include the point (9,-12) we know that if we substitute x=9 and y=-12 into y = kx we will have a true equation, so we do that: y = k·x -12 = k·9 -12 = 9k We divide both sides by 9 to solve for k: = = k So the constant k is , and so we substitute that for k in y = k·x and get the answer: y = x  

hope this helped good luck! :)
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smolbean44
smolbean44 smolbean44
  • 12-01-2018
Y= -4/3x
Hope this helps
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