anonymous
  • anonymous
find the value of y
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
freckles
  • freckles
those are length measurements right?
freckles
  • freckles
if so you might want to solve for x first then use similar triangles to find y

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anonymous
  • anonymous
Okay, but i dont know how to
freckles
  • freckles
we are given that 5x+8 is equal to 21x
freckles
  • freckles
can you solve for x now?
freckles
  • freckles
I'm asking if you know how to solve 5x+8=21x for x?
anonymous
  • anonymous
Subtract 8 from both sides?
freckles
  • freckles
8 has no friends on the other side why not trying to subtract 5x on both sides
anonymous
  • anonymous
i got you,okay so x=8
freckles
  • freckles
wait did you subtract 5x on both sides? 8=21x-5x 8=16x now divide both sides by 16
anonymous
  • anonymous
2?
freckles
  • freckles
8/16 shouldn't be 2 but 1/2
freckles
  • freckles
these are two difference numbers
anonymous
  • anonymous
okay so i got 0.5
freckles
  • freckles
anyways x=1/2 which means if x=1/2 then 21x is 21/2 or if you plugged x into the other expression 5x+8 you should still get 21/2 moving the bar up to show the similar triangles in a more obvious way: |dw:1438743769937:dw|
freckles
  • freckles
now set up your equivalent ratios and solve for y
freckles
  • freckles
|dw:1438743912912:dw| \[\frac{a}{c}=\frac{a+b}{c+d}\]

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