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AlexisDelgado

  • 4 years ago

Using elimination to solve the system 2x + y = 8 and x + y = 4, which of the following could be the first step? A. 2x + y = 8--------> 2x + y = 8 (x + y = 4)(-1)---> -x - y = -4 B. 2x + (4 - x) = 8 C. 2x + y = x + y D. 3x + 2y = 12 E. x = 4

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  1. vishal_kothari
    • 4 years ago
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    x—2 equations combined: 2x + y - x - y = 8 - 4 x = 4 y—1st equation, substitute x with 4: 2(4) + y = 8 8 + y = 8 y = 0 Answer: x = 4, y = 0 Proof—2nd equation: 4 + 0 = 4 4 = 4....

  2. AlexisDelgado
    • 4 years ago
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    So the answer is ?

  3. vishal_kothari
    • 4 years ago
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    Answer: x = 4, y = 0

  4. vishal_kothari
    • 4 years ago
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    i mean x = 4

  5. AlexisDelgado
    • 4 years ago
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    but its asking for the first step

  6. vishal_kothari
    • 4 years ago
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    i also that it is the first step....

  7. vishal_kothari
    • 4 years ago
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    *mean

  8. AlexisDelgado
    • 4 years ago
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    ok

  9. vishal_kothari
    • 4 years ago
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    thanks...

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