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anonymous

  • 4 years ago

y = 4x + 9 y = x solve by substitution. please help!

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  1. anonymous
    • 4 years ago
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    since y = x you can write x for y in the first equation x = 4x + 9 x - 4x = 9 -3x = 9 x = -3

  2. anonymous
    • 4 years ago
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    how did you get -4 ?

  3. anonymous
    • 4 years ago
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    and -3x ?

  4. anonymous
    • 4 years ago
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    got it , thank you!!!!!!!!!!! :)

  5. anonymous
    • 4 years ago
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    i need help in one more question, if you have time?

  6. anonymous
    • 4 years ago
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    ya

  7. anonymous
    • 4 years ago
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    y = -3x - 5 y = 4x + 9

  8. anonymous
    • 4 years ago
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    be right back, but you can show me how to do it, and ill give u a medal when i come back (10 mins) thank you!

  9. anonymous
    • 4 years ago
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    we can calute be substitution method ....4x+9=-3x-5 4x-3x=-5-9 x=-14 now we get x=-14 put the vaue of x we get value of y\].

  10. anonymous
    • 4 years ago
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    @justinee u undrstand

  11. anonymous
    • 4 years ago
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    yes, but why is it 4x - 3x ?

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