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anonymous

  • one year ago

Is this right? 20. Determine the solution of the system. Show your work. Y = 5x – 9 -5x -5 -14 Y = 2x + 6 -2 -2 4

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  1. anonymous
    • one year ago
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    no. these equations are already solved for y, so set them equal to each other to solve for x. 5x - 9 = 2x + 6

  2. anonymous
    • one year ago
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    Oh, thanks. thought it would of been harder then that XD

  3. anonymous
    • one year ago
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    Can you help me out on my next problem?

  4. anonymous
    • one year ago
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    ok. did you get a y-value for the one above?

  5. anonymous
    • one year ago
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    Isn't that the same as the x vaule?

  6. anonymous
    • one year ago
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    5x -9 =2x +6

  7. anonymous
    • one year ago
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    not necessarily. when they say "solve the system" they're asking for a point that makes both equations true. that point will have an x-coordinate and a y-coordinate. Once you have the x, substitute it into either one to get y

  8. anonymous
    • one year ago
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    what did you get when you solved that equation for x?

  9. anonymous
    • one year ago
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    -4x

  10. anonymous
    • one year ago
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    5x -9 =2x +6 I added both x terms then subtracted -9 from 6 7 x- 3 7/7 -3/7

  11. anonymous
    • one year ago
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    You can't add/subtract things on different sides of an equal sign. You can move things from one side to the other using addition or subtraction. Let's start by getting all the terms with x on the left side. To do that we need to eliminate 2x from the right side. Since 2x is positive, subtract 2x from both sides. |dw:1435682067537:dw|

  12. anonymous
    • one year ago
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    |dw:1435682227453:dw|

  13. anonymous
    • one year ago
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    Now you need to move -9 to the right side by adding 9 to both sides. Give it a try

  14. anonymous
    • one year ago
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    |dw:1435693135233:dw| Do i divide next

  15. anonymous
    • one year ago
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    should be 3x = 15, then divide

  16. anonymous
    • one year ago
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    I was suppose to write 15 DX

  17. anonymous
    • one year ago
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    Alright.

  18. anonymous
    • one year ago
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    |dw:1435693293586:dw|

  19. anonymous
    • one year ago
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    right. x = 5. Now to get y, you have to substitute into either equation. y = 2x + 6 y = 2(5) + 6 = ?

  20. anonymous
    • one year ago
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    y =2(5) + 6 10 + 6 =16 y16

  21. anonymous
    • one year ago
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    yes, so the solution the system is (5, 16).

  22. anonymous
    • one year ago
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    X= 5 and y = 16. Do i plug them back into the original equation?

  23. anonymous
    • one year ago
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    those are the answers. You can plug them in to check.

  24. anonymous
    • one year ago
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    Do i need to do it or could i let it ride :P

  25. anonymous
    • one year ago
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    no you don't need to. who's gonna know anyway?

  26. anonymous
    • one year ago
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    :P Yay. Thanks for your help ^ ^

  27. anonymous
    • one year ago
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    no problem

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