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jj2cool101

  • 2 years ago

What is the value of the x variable in the solution to the following system of equations? 7x - 2y = 21 4x + y = 57 21 -21 9 -9

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  1. jj2cool101
    • 2 years ago
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    help.... :=(

  2. jj2cool101
    • 2 years ago
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    can you help me ?

  3. JoãoVitorMC
    • 2 years ago
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    sure, i will calculate here

  4. jj2cool101
    • 2 years ago
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    its negative right

  5. JoãoVitorMC
    • 2 years ago
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    7x - 2y = 21 --> eq.[1] 4x + y = 57 --> eq.[2]

  6. JoãoVitorMC
    • 2 years ago
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    from eq.[2] we have y = 57 - 4x. substitute it in eq.[1] we have: 7x -2(57 -4x) = 21 7x -144 +8x =21 15x = 135 x =9

  7. jj2cool101
    • 2 years ago
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    oh thanks i was using another meathod

  8. JoãoVitorMC
    • 2 years ago
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    wc :)

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