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bleumom22

  • one year ago

Solve X+Y= 1 X-Y= 7

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  1. ashlynn143
    • one year ago
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    there has to be like one

  2. ashlynn143
    • one year ago
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    of the answers

  3. ashlynn143
    • one year ago
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    to the variables

  4. ashlynn143
    • one year ago
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    is that the whole question ???

  5. incomplte
    • one year ago
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    Its a simultaenous equation do you have any ideas?

  6. bleumom22
    • one year ago
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    yes thats the whole question the + equation is on top of the - equation

  7. ashlynn143
    • one year ago
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    oh i hate question like this

  8. bleumom22
    • one year ago
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    I don't have a clue it all looks foriegn to me. I looked through my notes and I see nothing similar to this problem.

  9. ashlynn143
    • one year ago
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    yah i've learned some really tough things and i have never done something like this

  10. incomplte
    • one year ago
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    Start by\[X=1-Y\] Plug that into the second eqn

  11. bleumom22
    • one year ago
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    ok but htne there aren't any values for the the other equations do I'm suiming it has to be a negative number. someone told me for a similar problem with one negative answer and one positive answer I could add both equations and then muliplty the result and substitute it for either varible to find the other. it worked for that problem but not for this one wwhere both answers are positive

  12. bleumom22
    • one year ago
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    then*

  13. ashlynn143
    • one year ago
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    well if it is like how @incomplte said then i have the answer but if it is like how you are saying then i dont know

  14. bleumom22
    • one year ago
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    ok ill try it his way but im still coming up blank

  15. ashlynn143
    • one year ago
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    ok for the second one it is 1 - (-7)

  16. ashlynn143
    • one year ago
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    AND YOU WOULD GET ????

  17. bleumom22
    • one year ago
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    8

  18. incomplte
    • one year ago
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    Eqn 2 becomes\[(1-Y)-Y = 7\] So1-2Y=7 -2Y=6 Y=-3

  19. ashlynn143
    • one year ago
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    correct @bleumom22 see now you get for #2

  20. incomplte
    • one year ago
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    Can you solve for X now?

  21. bleumom22
    • one year ago
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    just substitiue for y and then ill get the x variable?

  22. incomplte
    • one year ago
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    Good. Let me know what you get for X

  23. bleumom22
    • one year ago
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    ok x=4?

  24. incomplte
    • one year ago
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    Yes.

  25. ashlynn143
    • one year ago
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    good job

  26. bleumom22
    • one year ago
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    im sorry can you tell me the first step to solving this.

  27. incomplte
    • one year ago
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    Glad to help :)

  28. bleumom22
    • one year ago
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    I have two exams next week and need to remember this.

  29. incomplte
    • one year ago
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    Just start by Solving for X So from X+Y=1, say X=1-Y then plug that into the second equation.

  30. bleumom22
    • one year ago
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    oooh. ok and then just input the answer for one of the variables then divide the varible by its self and the answer by its self to get the variable's value?

  31. bleumom22
    • one year ago
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    as one of the varibles* to reverse calculate?

  32. incomplte
    • one year ago
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    Yes. If you have any more questions just @ my username. Ill get a notification and i can help later

  33. ashlynn143
    • one year ago
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    and i will try to help you if you need it ok

  34. bleumom22
    • one year ago
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    ok thank you to @incomplte and @ashlynn143

  35. ashlynn143
    • one year ago
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    your welcome i gtg for like 15 min

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