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anonymous

  • 5 years ago

I have 7z - 3x = 18 2z = 1 + 5x And now I dk what to do

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  1. anonymous
    • 5 years ago
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    ok thanks so much

  2. anonymous
    • 5 years ago
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    x=1 and z=3

  3. anonymous
    • 5 years ago
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    The is a literal equation with substitution I flipped the 2z = 1 + 5x It was originally 2z - 5x = 1

  4. anonymous
    • 5 years ago
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    it doesnt matter:)

  5. amistre64
    • 5 years ago
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    divide by 2 to get z alone

  6. anonymous
    • 5 years ago
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    I divide what by two?

  7. amistre64
    • 5 years ago
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    2z = 1 + 5x -----------; z = (1/2) +(5/2)x 2

  8. anonymous
    • 5 years ago
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    What about the first equation?

  9. amistre64
    • 5 years ago
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    what about it?

  10. anonymous
    • 5 years ago
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    What happens to it

  11. amistre64
    • 5 years ago
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    you sub the z value into it and solve for x

  12. amistre64
    • 5 years ago
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    7z - 3x = 18 7((1/2)+(5/2)x) - 3x = 18

  13. anonymous
    • 5 years ago
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    Then what do I do?

  14. amistre64
    • 5 years ago
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    7((1/2)+(5/2)x) - 3x = 18 (2) 7(1+5x) - 6x = 36

  15. amistre64
    • 5 years ago
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    7+35x -6x = 36 x = 1

  16. anonymous
    • 5 years ago
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    Ugh. Now I should have known that!

  17. amistre64
    • 5 years ago
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    i goofed that answer but you see it lol

  18. anonymous
    • 5 years ago
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    What about the 7?

  19. anonymous
    • 5 years ago
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    Doesn't it get multiplied by 2 also?

  20. amistre64
    • 5 years ago
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    7+35x -6x = 36 29x = 29 ..... x=1; lol thats a coincidents

  21. amistre64
    • 5 years ago
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    lets focus on that part and see what I did ok?

  22. amistre64
    • 5 years ago
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    1+5x 7( ----- ) times 2 = 7(1+5x) 2

  23. anonymous
    • 5 years ago
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    How do I find the Y again?

  24. anonymous
    • 5 years ago
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    Because I am confused about that bit right know?

  25. amistre64
    • 5 years ago
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    the y or the z?

  26. anonymous
    • 5 years ago
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    Sorry, Z

  27. amistre64
    • 5 years ago
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    ok... do you see why when we mulitply by 2 we get 7(1+5x) tho?

  28. anonymous
    • 5 years ago
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    Yes

  29. amistre64
    • 5 years ago
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    then lets solve for x: 7+35x -6x = 36 ; -7 and add like terms 7-7+35x -6x = 36-7 29x = 29 x = 1 right?

  30. anonymous
    • 5 years ago
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    Yes I have the much of the problem solved :D

  31. amistre64
    • 5 years ago
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    2z = 1 + 5x 2z = 1+5 2z = 6 z = 3

  32. anonymous
    • 5 years ago
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    Finally the problem is finished :D

  33. amistre64
    • 5 years ago
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    once you know what x is....use it lol

  34. anonymous
    • 5 years ago
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    Thks again!!!!!!!!!!!!!!

  35. amistre64
    • 5 years ago
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    yw :)

  36. anonymous
    • 5 years ago
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    The problem looks like this 7z - 3x = 18 2z - 5x = 1 changes to 2z = 1 + 5x Then I divide 2z by 2 to get 7z - 3x = 18 z = 1/2 5x/2 which turns to 7(1/2) 5x/2) - 3x = 18 which turns to 7 + 35x -6x = 36 which turns to 7 + 29x = 36 which turns to 29x = 29 then x = 1 then 2z = 1 + 5 (1) 2z = 1 + 5 2z = 6 z = 3 (1,3)

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