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krissywatts

  • 3 years ago

ues substition method to fin solution sets: I need step by step help 2a+4b=-24 a=20-2b

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  1. mathstudent55
    • 3 years ago
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    In the substitution method, you first need to solve one equation for one variable. In this case, that step is already done because the second equation shows what a is equal to. In other words, the second equation is already soved for a.

  2. mathstudent55
    • 3 years ago
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    The second step is to substitute the variable a in the first equation with what a is equal to in the second equation. Since a = 20 - 2b, everywhere you see a in the firtst equation, wrtite 20 - 2b

  3. krissywatts
    • 3 years ago
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    i have a+b=-12 a+2b=20 is this correct?

  4. mathstudent55
    • 3 years ago
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    No. The first equation is 2a + 4b = -24 Where you see a, write (20 - 2b) You should have no a's left there.

  5. krissywatts
    • 3 years ago
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    i get -4 is this correct?

  6. krissywatts
    • 3 years ago
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    as my finale answer

  7. krissywatts
    • 3 years ago
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    for b

  8. mathstudent55
    • 3 years ago
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    You ask for step by step help. I give you step by step help, but you skip a bunch of steps. You still haven't shown what you got after the substitution.

  9. mathstudent55
    • 3 years ago
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    The first equation is 2a + 4b = -24 Where you see a, write (20 - 2b)

  10. krissywatts
    • 3 years ago
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    i did

  11. mathstudent55
    • 3 years ago
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    Where is it then? It should look like this: 2a + 4b = -24 2(20 - 2b) + 4b = -24

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