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anonymous

  • 4 years ago

How many solutions exist for the system y = 2x + 5 and y = -0.2x - 4? A. no solution B. one solution C. infinitely many solutions

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  1. TuringTest
    • 4 years ago
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    \[y=2x+5\]\[y=-0.2x-4\]multiply the second equation by ten\[y=2x+5\]\[y=-2x-40\]add them together and see if you get a statement that is always true, never true, or a single answer. If it is always true, infinite solutions. If it is never true, no solutions. If it yields an answer, that is the 1 solution.

  2. TuringTest
    • 4 years ago
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    \[10y=-2x-40\]supposed to be in las line

  3. anonymous
    • 4 years ago
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    If it is always true, infinite solutions. If it is never true, no solutions. If it yields an answer, that is the 1 solution. I don't understand :(

  4. anonymous
    • 4 years ago
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    I think we have B. one solution in here.

  5. anonymous
    • 4 years ago
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    Oh got it Turing :)

  6. anonymous
    • 4 years ago
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    It was rather an elementary approach :)

  7. TuringTest
    • 4 years ago
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    ... you can try to figure it out is always my response. It may be enlightening\[\large y=2x+5\]\[\large 10y=-2x-40\]add 'em up.

  8. anonymous
    • 4 years ago
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    You mean if it's an identity then no solutions right?

  9. TuringTest
    • 4 years ago
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    :/ yeah, that makes perfect sense...

  10. anonymous
    • 4 years ago
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    lol, why that face? :)

  11. TuringTest
    • 4 years ago
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    Your sarcastic witicisms try to confound me. It almost works at times ;)

  12. anonymous
    • 4 years ago
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    thanks for the help :D

  13. anonymous
    • 4 years ago
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    Hehe, I can never to do that to you ;)

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