anonymous
  • anonymous
Absolute Value Equations 5n-3=|n+9| I got 3 and -1 I keep plugging in -1 but it gives me positive 8 and not negative. Help?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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marigirl
  • marigirl
If you are trying to find the point of intersection (i.e which point do both of these equations meet) then n=3 is your only solution because the absolute function will not intersect at a negative axis..
marigirl
  • marigirl
using n=3 you can obtain your coordinate of the point of intersection
anonymous
  • anonymous
I'm supposed to solve each equation. Whatever the n is should match up if you plug them in.

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marigirl
  • marigirl
right i got it, so then at n=3 it intersects (3,12) also at n=-1 it intersects (-1,8)
marigirl
  • marigirl
do the answers given to you show a negative 8 ? is that the question
anonymous
  • anonymous
5(3)-3 is 12. 3+9 is 12. Good. 5(-1)-3 is -8. |-1+9| is 8.
anonymous
  • anonymous
@marigirl is correct. n = 3 is the only solution because n = -1 is an extraneous (fake) solution.
marigirl
  • marigirl
but that function we did - (5n-3) so then that becomes -5n+3
anonymous
  • anonymous
yes but the -1 is supposed to be substituted into the original equation to check the result. When you do that you get 8 on one side an -8 on the other, so -1 doesn't work for this equation
triciaal
  • triciaal
|dw:1440734476898:dw|
triciaal
  • triciaal
the absolute value means only use the positive value
triciaal
  • triciaal
is the original function -(5n-3) ?

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