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DragonFlame

  • 2 years ago

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

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  1. hartnn
    • 2 years ago
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    y-2x = 8 add 2x on both sides, what u get ?

  2. DragonFlame
    • 2 years ago
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    y=9+2y

  3. hartnn
    • 2 years ago
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    now plug in y= 8+2x in 2nd equation

  4. DragonFlame
    • 2 years ago
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    I thought of doing -2x=8-y

  5. hartnn
    • 2 years ago
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    that can work, but things will get complicated soon.

  6. DragonFlame
    • 2 years ago
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    16+4x=2(8+2x)

  7. DragonFlame
    • 2 years ago
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    I see... I will use the way u told me than

  8. hartnn
    • 2 years ago
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    yes, simplify 2(8+2x)

  9. DragonFlame
    • 2 years ago
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    16+4x=16+4x

  10. DragonFlame
    • 2 years ago
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    O.O IMPOSSIBLE

  11. hartnn
    • 2 years ago
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    correct. now think logically, when is that true

  12. hartnn
    • 2 years ago
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    not impossible its like 0=0

  13. DragonFlame
    • 2 years ago
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    S0 infinite number of solutions

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

  15. DragonFlame
    • 2 years ago
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    yay! Thanks so much

  16. mathmale
    • 2 years ago
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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."

  17. DragonFlame
    • 2 years ago
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    I see, Thanks :)

  18. mathmale
    • 2 years ago
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    :)

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