betsy81 betsy81
  • 21-06-2017
  • Mathematics
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If the perimeter of the following triangle is 7x-2, what is the length of the unknown side?

If the perimeter of the following triangle is 7x2 what is the length of the unknown side class=

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musiclover10045
musiclover10045 musiclover10045
  • 21-06-2017

perimeter = s+s+s

 so 7x-2 = (3x-9) + (x+7) + ?


3x-9 + x+7 = 4x-2

7x-2 - 4x-2 = 3x


remaining side is 3x

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Аноним Аноним
  • 21-06-2017
 unknown side = 7x-2 - (3x - 9 + x + 7)
 unknown side = 7x - 2 -3x + 9 -x - 7
 unknown side = = 3x 

answer

 unknown side = 3x
Answer Link

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