pokemon23
  • pokemon23
If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me @Mathematics
Mathematics
schrodinger
  • schrodinger
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pokemon23
  • pokemon23
20+x=55-4x
heisenberg
  • heisenberg
setup an equation with simple algebra. The "unknown" = the "number."
pokemon23
  • pokemon23
is this correct?

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heisenberg
  • heisenberg
Yep that's right.
pokemon23
  • pokemon23
thanks
heisenberg
  • heisenberg
can you solve those together? there are a few techniques for this.
pokemon23
  • pokemon23
let me see
pokemon23
  • pokemon23
20=55-3x
pokemon23
  • pokemon23
75=-3x
heisenberg
  • heisenberg
not quite. to get rid of the x on the left, subtract x to both sides. -4x - (1)x = -5x
heisenberg
  • heisenberg
same with the 55.
pokemon23
  • pokemon23
75=-5x
heisenberg
  • heisenberg
what about: 25 - 55 = ?
pokemon23
  • pokemon23
isn't 20
pokemon23
  • pokemon23
subtract 55
heisenberg
  • heisenberg
it's a negative number.
pokemon23
  • pokemon23
?????????
heisenberg
  • heisenberg
20 - 55 = -35
heisenberg
  • heisenberg
you have to subtract 55 from both sides.
pokemon23
  • pokemon23
where did you get -35
heisenberg
  • heisenberg
20 - 55 = 20 + -55 = -55 + 20 = -35
pokemon23
  • pokemon23
-35=-5x
heisenberg
  • heisenberg
that's right.
pokemon23
  • pokemon23
x=7
pokemon23
  • pokemon23
ty sir?
heisenberg
  • heisenberg
booyah.
pokemon23
  • pokemon23
lol

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