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Solmyr

  • one year ago

Trevor solved the system of equations below. What mistake did he make in his work? 2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 − 2x) = 10 x − 10 + 4x = 10 5x − 10 = 10 5x = 0 x = 0 2(0) + y = 5 y = 5 He should have substituted 5 + 2x He combined like terms incorrectly, it should have been 4x instead of 5x He subtracted 10 from the right side instead of adding 10 to the right side He made no mistake

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  1. azolotor
    • one year ago
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    He made no mistakes. Follow through his work and do it yourself and you will find that those answer are correct. You could also plug the values in for x and y and see if they check out.

  2. Solmyr
    • one year ago
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    ok thank you

  3. phi
    • one year ago
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    5x − 10 = 10 5x = 0 Do you see anything wrong with this step? I do.

  4. Solmyr
    • one year ago
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    ok

  5. Solmyr
    • one year ago
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    i do see that i didnt see that before

  6. phi
    • one year ago
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    what happens if you add +10 to both sides? Like this: 5x − 10 +10 = 10+10

  7. azolotor
    • one year ago
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    Sorry, he is right. I should have been wearing my glasses.

  8. phi
    • one year ago
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    do you see that -10 +10 is 0 ? 5x − 10 +10 = 10+10 becomes 5x = 10+10

  9. phi
    • one year ago
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    and 10+10 is 20 so you get 5x=20 which does not match what Tevor did in the problem

  10. Solmyr
    • one year ago
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    srrry was afk so its C?

  11. azolotor
    • one year ago
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    yes

  12. Solmyr
    • one year ago
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    ok thank you guys

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