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anonymous

  • one year ago

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?

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  1. marigirl
    • one year ago
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    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..

  2. marigirl
    • one year ago
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    using n=3 you can obtain your coordinate of the point of intersection

  3. anonymous
    • one year ago
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    I'm supposed to solve each equation. Whatever the n is should match up if you plug them in.

  4. marigirl
    • one year ago
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    right i got it, so then at n=3 it intersects (3,12) also at n=-1 it intersects (-1,8)

  5. marigirl
    • one year ago
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    do the answers given to you show a negative 8 ? is that the question

  6. anonymous
    • one year ago
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    5(3)-3 is 12. 3+9 is 12. Good. 5(-1)-3 is -8. |-1+9| is 8.

  7. anonymous
    • one year ago
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    @marigirl is correct. n = 3 is the only solution because n = -1 is an extraneous (fake) solution.

  8. marigirl
    • one year ago
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    but that function we did - (5n-3) so then that becomes -5n+3

  9. anonymous
    • one year ago
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    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

  10. triciaal
    • one year ago
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    |dw:1440734476898:dw|

  11. triciaal
    • one year ago
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    the absolute value means only use the positive value

  12. triciaal
    • one year ago
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    is the original function -(5n-3) ?

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