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EmmaH Group Title

is -x-4x=3x??

  • one year ago
  • one year ago

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  1. JoãoVitorMC Group Title
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    only if x=0

    • one year ago
  2. mathstudent55 Group Title
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    -x is the same as -1x -4x is -4 x If you had -1 -4 what do you get?

    • one year ago
  3. mathstudent55 Group Title
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    -1 - 4 = ?

    • one year ago
  4. EmmaH Group Title
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    -5?

    • one year ago
  5. EmmaH Group Title
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    im having a lot of trouble with this Solve the system. y = 2 - x and y = 4x + 7 (1, 1) (1, 3) (-1, 3) (-1, 1) no solution im prettyy sure tis no solution

    • one year ago
  6. mathstudent55 Group Title
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    Right, so since -1 - 4 = -5, then -x - 4x = -5x

    • one year ago
  7. mathstudent55 Group Title
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    Now the system. Again, you have the two equations solved for y already, so use substitution.

    • one year ago
  8. mathstudent55 Group Title
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    Do you remember from the two previous systems what to do next?

    • one year ago
  9. EmmaH Group Title
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    yes im working ion it

    • one year ago
  10. mathstudent55 Group Title
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    Ok, let me see what you're up to since you're having trouble with it.

    • one year ago
  11. EmmaH Group Title
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    ok so i had 2-x=4x+7 2-x +2=4x+7+2 -x=4x+9 -x-4x=9 now im stuck

    • one year ago
  12. mathstudent55 Group Title
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    The 2 on the left side is positive, so you need to subtract 2 from both sides.

    • one year ago
  13. seanwalsh1984 Group Title
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    -x (so -1x) take away 4 more x's. It's like being $1 in the hole in the bank account. Spend four more bucks, and you are $5 in the whole, not $3. However... -x - 4x = 3x is interesting because: -x - 4x + x = 3x + x Then we have -4x = 3x Then as said above, if x = 0, then it is true, otherwise no. Hope this helps.

    • one year ago
  14. mathstudent55 Group Title
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    2 - x = 4x + 7 2 - 2 - x = 4x + 7 - 2 -x = 4x + 5 Now subtract 4x from both sides

    • one year ago
  15. EmmaH Group Title
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    -4-4x=5

    • one year ago
  16. mathstudent55 Group Title
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    -x - 4x = 4x - 4x + 5 -5x = 5

    • one year ago
  17. EmmaH Group Title
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    x=-1?

    • one year ago
  18. mathstudent55 Group Title
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    |dw:1356283149364:dw|

    • one year ago
  19. mathstudent55 Group Title
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    right, x = -1

    • one year ago
  20. mathstudent55 Group Title
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    Now insert this value of x in one of the original equations, and solve for y

    • one year ago
  21. EmmaH Group Title
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    sorry i had to do something i do it one sec

    • one year ago
  22. EmmaH Group Title
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    1,3 ?

    • one year ago
  23. mathstudent55 Group Title
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    y = 3. You're right, but remember x = -1, not x = 1

    • one year ago
  24. EmmaH Group Title
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    thanks you!

    • one year ago
  25. mathstudent55 Group Title
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    |dw:1356283635553:dw|

    • one year ago
  26. mathstudent55 Group Title
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    You're welcome.

    • one year ago
  27. EmmaH Group Title
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    one more question The ordered pair (-1, -1) is a solution of the system -4x + 2y = 2 and x + y = -2. True False

    • one year ago
  28. EmmaH Group Title
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    i think its true

    • one year ago
  29. mathstudent55 Group Title
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    Substitute the ordered pair into both equations. If it makes them both true, it's a solution.

    • one year ago
  30. EmmaH Group Title
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    ok i did it its true

    • one year ago
  31. mathstudent55 Group Title
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    -4x + 2y = 2 Try (-1, -1) Is -4(-1) + 2(-1) = 2 ? 4 - 2 = 2? Yes. The ordered pair works in the first equation. Now try the second. x + y = -2 Is -1 + (-1 ) = -1 true? -2 = -2. It's true. You are correct, (-1, -1) is a solution.

    • one year ago
  32. mathstudent55 Group Title
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    Good job!

    • one year ago
  33. EmmaH Group Title
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    =D

    • one year ago
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