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anonymous

  • one year ago

Find x if y=-2 4x-6/y=15

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  1. jtvatsim
    • one year ago
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    Do you have any ideas? What might you think to do first?

  2. anonymous
    • one year ago
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    I think subtract 4x in both sides

  3. jtvatsim
    • one year ago
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    So, if we do that, what will we have then?

  4. anonymous
    • one year ago
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    idk that's the part I don't get

  5. jtvatsim
    • one year ago
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    OK, good. We'll start there. You have 4x - 6/y = 15. By subtracting 4x from both sides we are saying: 4x - 6/y - 4x = 15 - 4x. The left side has a nice cancellation, 4x - 4x - 6/y = 15 - 4x 0 - 6/y = 15 - 4x -6/y = 15 - 4x This is what is left after subtracting 4x from both sides. Does that make sense so far?

  6. anonymous
    • one year ago
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    whats the answer though I need to find x

  7. jtvatsim
    • one year ago
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    Good! That's what I was going to ask next. The question wants us to find x. But we have a weird y in the equation. Do we know anything about y?

  8. anonymous
    • one year ago
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    you need to take out y

  9. jtvatsim
    • one year ago
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    That would be nice. Look at the question too. It seems to tell us that y = -2.

  10. jtvatsim
    • one year ago
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    So, we are allowed to replace any y's we see with a -2 instead.

  11. jtvatsim
    • one year ago
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    This means that -6/y = 15 - 4x is really the same as -6/-2 = 15 - 4x which is a little easier.

  12. jtvatsim
    • one year ago
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    Any questions on that part so far?

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