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brandoduh

  • 4 years ago

Solve using substitution 2x=y+9 5y=10x-45

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  1. lgbasallote
    • 4 years ago
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    if 2x = y + 9 then let y = 2x - 9 make sense?

  2. brandoduh
    • 4 years ago
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    no really :/

  3. gypsi
    • 4 years ago
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    find one variable, either x or y, first

  4. brandoduh
    • 4 years ago
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    i think ill choose x

  5. gypsi
    • 4 years ago
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    so if you get x alone for one equation, you then replace what you get into the second equation and solve for y

  6. brandoduh
    • 4 years ago
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    so i mutiply 10x on all 3 of the first equation?

  7. gypsi
    • 4 years ago
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    o.O? to get x alone? or?

  8. brandoduh
    • 4 years ago
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    to subtract it with the other equation?

  9. gypsi
    • 4 years ago
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    are you trying to solve it by elimination?

  10. brandoduh
    • 4 years ago
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    no by substitution

  11. gypsi
    • 4 years ago
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    if you get Y alone in the first equation it would be what the first person said y=2x-9 then you substitute the 2x-9 into the second equation getting 5(2x-9)=10x+45

  12. gypsi
    • 4 years ago
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    10x-45=10x-45*

  13. brandoduh
    • 4 years ago
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    oh i kinda get it. then you multipy 5 on the parantesis

  14. brandoduh
    • 4 years ago
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    than you add like terms?

  15. gypsi
    • 4 years ago
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    both sides equal each other if you combine like terms you get 0=0

  16. brandoduh
    • 4 years ago
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    :o o? wow. now i have to solve the other 1

  17. gypsi
    • 4 years ago
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    good luck! hope it helped.

  18. brandoduh
    • 4 years ago
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    its sure did friend=)

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