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anonymous

  • one year ago

FAN AND MEDAL***

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  1. anonymous
    • one year ago
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    Given the system of equations presented here: 4x + y = 4 2x + 7y = 28

  2. anonymous
    • one year ago
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    Which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? A)Multiply the second equation by −1 to get −2x − 7y = −28 B)Multiply the second equation by −4 to get −8x − 28y = −112 C)Multiply the first equation by −7 to get −28x − 7y = −28 D)Multiply the first equation by −2 to get −8x − 2y = −8

  3. anonymous
    • one year ago
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    @Astrophysics @DanJS

  4. DanJS
    • one year ago
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    Have you done this thing before?

  5. anonymous
    • one year ago
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    no, i think i posted but nobody answered ;/

  6. DanJS
    • one year ago
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    You can multiply an entire equation through by a number and it will not change the line... you want to do that on one of the two, so when you add them together, one variable cancels out to zero

  7. DanJS
    • one year ago
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    There is more than one way to do it, but by the choices, we will eliminate the y by multiplying the first equation through by a -7, so -7y + 7y = 0 4x + y = 4 2x + 7y = 28 -28x - 7y = -28 2x + 7y = 28 ------------------ add together -26x = 0

  8. anonymous
    • one year ago
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    its C?

  9. DanJS
    • one year ago
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    yes

  10. anonymous
    • one year ago
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    THANK YOU!!!! DANJS

  11. DanJS
    • one year ago
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    welcome

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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