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anonymous

  • 5 years ago

Solve by the substitution method please 7x+y=-13 -5x+y=17 what is the order pair?

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  1. anonymous
    • 5 years ago
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    I have tried to work it out myself and this is what I got. -5x+y(-7x-13)=17 So I going with x=-35/7 which gave me -5 so that is my x but I can get my y= yet. I tried and gt 22/20 thats not right?????

  2. anonymous
    • 5 years ago
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    Your process seemed right, but I got x to be -5/2

  3. anonymous
    • 5 years ago
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    Also realize there is no y once you substitute it into that one equation, I think you just had a typo though.

  4. anonymous
    • 5 years ago
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    but -5/2 is 2.5

  5. anonymous
    • 5 years ago
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    the 22/20 is what I got

  6. anonymous
    • 5 years ago
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    for y

  7. anonymous
    • 5 years ago
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    For y I got 9/2. Now you can check these numbers if you plug them into one of the equations and both sides are equal.

  8. anonymous
    • 5 years ago
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    So can you help me with it again

  9. anonymous
    • 5 years ago
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    Yes. So it looks like you tried to solve the first equation for y to get y=-7x-13 Then it looked like you plugged it into the 2nd equation and should have gotten -5x+(-7x-13)=17

  10. anonymous
    • 5 years ago
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    All you need to do next is solve for x, plug it back into one of the equations and solve for y.

  11. anonymous
    • 5 years ago
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    so when I do that then I get 13y+17/7y+5 and the whole problem is negative with a neg.sign front understand

  12. anonymous
    • 5 years ago
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    I don't quite see what you are doing...-5x-7x-13=17 then -12x=30 then x=-5/2 so plug -5/2 into either of the equations to get y. So for example, -5(-5/2)+y=17 then (25/2)+y=17 and y=9/2

  13. anonymous
    • 5 years ago
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    ok so what is the order pair

  14. anonymous
    • 5 years ago
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    can you please give me the order pair to this question

  15. anonymous
    • 5 years ago
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    (x,y) so (-5/2,9/2) which is the same as (-2.5,4.5)

  16. anonymous
    • 5 years ago
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    so that is the order pair?

  17. anonymous
    • 5 years ago
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    Yes. If you plug in both the x and y into either of those equations you should get the left side equal to the right.

  18. anonymous
    • 5 years ago
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    thanks again, is there a program that helps you work these out and learn them

  19. anonymous
    • 5 years ago
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    Not sure...

  20. anonymous
    • 5 years ago
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    so I need to put (-2.5,4.5) in or (-5/2, 9/2) in

  21. anonymous
    • 5 years ago
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    Yes.

  22. anonymous
    • 5 years ago
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    when I put in the first one it said incorrect!!!

  23. anonymous
    • 5 years ago
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    The answers are correct based on the equations you gave me. I promise.

  24. anonymous
    • 5 years ago
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    sorry the top one is suppose to be 4y sorry so 7x+4y=-13 and -5x+y=17 I am so sorry I could not figure out what I was doing wrong

  25. anonymous
    • 5 years ago
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    Lol no problem, but that does change things :P

  26. anonymous
    • 5 years ago
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    http://www.webmath.com/solver2.html here is something I found that does solve systems of equations, well at least 2 of them. I looked over their work, and it seems like it can be confusing. I would recommend trying to do them on your own solving for x or y like we did, and maybe using that website to check steps if you made a mistake. There's probably something better out there somewhere.

  27. anonymous
    • 5 years ago
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    So can I get the order pair for this then please and I can move on to the next.....please...

  28. anonymous
    • 5 years ago
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    x=-3 y=2 so (-3,2)

  29. anonymous
    • 5 years ago
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    i have to continue working on ths because I am still a little confused but trying to understand. Thanks for the help again....I have more to come....

  30. anonymous
    • 5 years ago
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    No problem.

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