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DragonFlame Group Title

Solve, using the substitution method. y – 2x = 8 16 + 4x = 2y

  • 10 months ago
  • 10 months ago

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  1. hartnn Group Title
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    y-2x = 8 add 2x on both sides, what u get ?

    • 10 months ago
  2. DragonFlame Group Title
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    y=9+2y

    • 10 months ago
  3. hartnn Group Title
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    now plug in y= 8+2x in 2nd equation

    • 10 months ago
  4. DragonFlame Group Title
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    I thought of doing -2x=8-y

    • 10 months ago
  5. hartnn Group Title
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    that can work, but things will get complicated soon.

    • 10 months ago
  6. DragonFlame Group Title
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    16+4x=2(8+2x)

    • 10 months ago
  7. DragonFlame Group Title
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    I see... I will use the way u told me than

    • 10 months ago
  8. hartnn Group Title
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    yes, simplify 2(8+2x)

    • 10 months ago
  9. DragonFlame Group Title
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    16+4x=16+4x

    • 10 months ago
  10. DragonFlame Group Title
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    O.O IMPOSSIBLE

    • 10 months ago
  11. hartnn Group Title
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    correct. now think logically, when is that true

    • 10 months ago
  12. hartnn Group Title
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    not impossible its like 0=0

    • 10 months ago
  13. DragonFlame Group Title
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    S0 infinite number of solutions

    • 10 months ago
  14. hartnn Group Title
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    you take any value of x or y 16+4x will always be = 16+4x so, yes, infinite solutions :)

    • 10 months ago
  15. DragonFlame Group Title
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    yay! Thanks so much

    • 10 months ago
  16. mathmale Group Title
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    Note how one of the given equations is a multiple of the other given equation. That's all the info you need to decide "infinitely many solutions."

    • 10 months ago
  17. DragonFlame Group Title
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    I see, Thanks :)

    • 10 months ago
  18. mathmale Group Title
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    :)

    • 10 months ago
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