Falling_In_Katt
  • Falling_In_Katt
***WILL MEDAL*** The perimeter of a triangle is 7a - 11b. If two of its sides are 2a + b and a - 9b, what is the third side?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
To find the perimeter you add up all the sides of the triangle
anonymous
  • anonymous
we'll us x to represent the missing side
anonymous
  • anonymous
(2a+b) + (a-9b) + x = 7a-11b

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anonymous
  • anonymous
now just simplify the equation and solve for x
anonymous
  • anonymous
Do you know how to do that?
anonymous
  • anonymous
first add all the like terms on the left side
anonymous
  • anonymous
3a - 8b + x = 7a-11b
anonymous
  • anonymous
now move the a and b terms to the right side of the equation to get x by itself
anonymous
  • anonymous
x = 4a - 3b
anonymous
  • anonymous
This means that the missing side is 4a - 3b
Falling_In_Katt
  • Falling_In_Katt
Ohhhhh that makes since .

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