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anonymous

  • one year ago

Which equations are equivalent to the given equation? 0.4y=10 Choose all answers that are correct. A. 0.4y=10÷0.4 B. 0.4y÷0.4=10÷0.4 C. 0.4y*2.5=10*2.5 D. 0.4y÷0.4=10*0.4

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  1. anonymous
    • one year ago
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    First, what can you do to get y by itself?

  2. anonymous
    • one year ago
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    I'm completely lost here.

  3. anonymous
    • one year ago
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    Haha np. We're basically trying to find different ways to simplify. If we have 0.4y=10 we can get y by itself by dividing 0.4 Ex: 0.4y/0.4 gets y alone. But what you do to one side, you must do to the other. So 0.4y/0.4 = 10/0.4

  4. anonymous
    • one year ago
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    Does that make sense at all?

  5. anonymous
    • one year ago
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    So B would be one of the answers?

  6. anonymous
    • one year ago
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    That would be correct! So when we solve the equation 0.4y=10 we end up with y=10/0.4 y=25. Do you see any other equations that get the same answer?

  7. anonymous
    • one year ago
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    A?

  8. anonymous
    • one year ago
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    Well lets try it out. 0.4y = 10/0.4 This simplifies out to be 0.4y = 25 Then, divide 0.4 from y, and (what you do to one side you do to the other) So you're gonna end up with y= 24/0.4 which gives you y=62.5

  9. anonymous
    • one year ago
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    So A is incorrect

  10. anonymous
    • one year ago
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    Yes

  11. anonymous
    • one year ago
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    It looks similar, so its kind of tricky

  12. anonymous
    • one year ago
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    C is another correct answer. 10*2.5=25

  13. anonymous
    • one year ago
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    Good job!! 0.4y x 2.5 = 10 x 2.5 0.4y/2.5 = 10 x2.5/2.5 (You do this to cancel it out) So you're gonna end up with 0.4y = 10 which brings you back to your original equation :)

  14. anonymous
    • one year ago
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    I believe A & C are the only correct answers. Am I correct?

  15. anonymous
    • one year ago
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    Well remember we proved A to be wrong, because it actually equals 62.5 B and C are the correct ones haha

  16. anonymous
    • one year ago
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    Sorry I meant B & C

  17. anonymous
    • one year ago
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    If my question is answered and the only correct answers are B & C then I thank you for helping me with my question and I will reward you with a medal.

  18. anonymous
    • one year ago
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    I believe those are the only correct ones! We proved A untrue, and D just seems to be all sorts of wrong. So no problem!

  19. anonymous
    • one year ago
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    Thank you very much.

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